/* ==========================================================================
   Zyrova Mood Journal - Main Styles
   ========================================================================== */

/* CSS Reset & Base Styles
   ========================================================================== */

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    line-height: 1.5;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-weight: 400;
    color: var(--color-text-primary);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* CSS Custom Properties (Variables)
   ========================================================================== */

:root {
    /* Brand Colors */
    --color-primary: #FF5722;
    --color-primary-light: #FF7043;
    --color-primary-dark: #E64A19;
    --color-primary-50: rgba(255, 87, 34, 0.05);
    --color-primary-100: rgba(255, 87, 34, 0.1);
    --color-primary-200: rgba(255, 87, 34, 0.2);
    
    /* Emotion Colors */
    --color-joy: #FFD700;
    --color-excitement: #FF6B35;
    --color-gratitude: #4CAF50;
    --color-serenity: #87CEEB;
    --color-sadness: #6495ED;
    --color-anxiety: #DDA0DD;
    --color-anger: #DC143C;
    --color-frustration: #FF4500;
    
    /* Neutral Colors */
    --color-white: #FFFFFF;
    --color-gray-50: #FAFAFA;
    --color-gray-100: #F5F5F5;
    --color-gray-200: #EEEEEE;
    --color-gray-300: #E0E0E0;
    --color-gray-400: #BDBDBD;
    --color-gray-500: #9E9E9E;
    --color-gray-600: #757575;
    --color-gray-700: #616161;
    --color-gray-800: #424242;
    --color-gray-900: #212121;
    
    /* Semantic Colors */
    --color-success: #4CAF50;
    --color-warning: #FF9800;
    --color-error: #F44336;
    --color-info: #2196F3;
    
    /* Text Colors */
    --color-text-primary: var(--color-gray-900);
    --color-text-secondary: var(--color-gray-600);
    --color-text-muted: var(--color-gray-500);
    --color-text-inverse: var(--color-white);
    
    /* Background Colors */
    --color-background: var(--color-white);
    --color-background-secondary: var(--color-gray-50);
    --color-background-tertiary: var(--color-gray-100);
    
    /* Border Colors */
    --color-border: var(--color-gray-200);
    --color-border-light: var(--color-gray-100);
    --color-border-dark: var(--color-gray-300);
    
    /* Shadow Colors */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Spacing Scale */
    --space-1: 0.25rem;  /* 4px */
    --space-2: 0.5rem;   /* 8px */
    --space-3: 0.75rem;  /* 12px */
    --space-4: 1rem;     /* 16px */
    --space-5: 1.25rem;  /* 20px */
    --space-6: 1.5rem;   /* 24px */
    --space-8: 2rem;     /* 32px */
    --space-10: 2.5rem;  /* 40px */
    --space-12: 3rem;    /* 48px */
    --space-16: 4rem;    /* 64px */
    --space-20: 5rem;    /* 80px */
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-full: 9999px;
    
    /* Typography Scale */
    --font-size-xs: 0.75rem;   /* 12px */
    --font-size-sm: 0.875rem;  /* 14px */
    --font-size-base: 1rem;    /* 16px */
    --font-size-lg: 1.125rem;  /* 18px */
    --font-size-xl: 1.25rem;   /* 20px */
    --font-size-2xl: 1.5rem;   /* 24px */
    --font-size-3xl: 1.875rem; /* 30px */
    --font-size-4xl: 2.25rem;  /* 36px */
    --font-size-5xl: 3rem;     /* 48px */
    
    /* Font Weights */
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Line Heights */
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    
    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;
}

/* Typography
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
}

h1 {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
}

h2 {
    font-size: var(--font-size-3xl);
}

h3 {
    font-size: var(--font-size-2xl);
}

h4 {
    font-size: var(--font-size-xl);
}

h5 {
    font-size: var(--font-size-lg);
}

h6 {
    font-size: var(--font-size-base);
}

p {
    margin-bottom: var(--space-4);
    line-height: var(--line-height-normal);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

strong, b {
    font-weight: var(--font-weight-semibold);
}

small {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

/* Layout Components
   ========================================================================== */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

@media (min-width: 640px) {
    .container {
        padding: 0 var(--space-6);
    }
}

@media (min-width: 1024px) {
    .container {
        padding: 0 var(--space-8);
    }
}

/* Button Components
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    line-height: 1;
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

.btn--primary {
    background-color: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.btn--primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: var(--color-white);
    text-decoration: none;
}

.btn--secondary {
    background-color: var(--color-white);
    color: var(--color-text-primary);
    border-color: var(--color-border-dark);
}

.btn--secondary:hover {
    background-color: var(--color-gray-50);
    color: var(--color-text-primary);
    text-decoration: none;
}

.btn--danger {
    background-color: var(--color-error);
    color: var(--color-white);
    border-color: var(--color-error);
}

.btn--danger:hover {
    background-color: #D32F2F;
    border-color: #D32F2F;
    color: var(--color-white);
    text-decoration: none;
}

.btn--ghost {
    background-color: transparent;
    color: var(--color-text-primary);
    border-color: transparent;
}

.btn--ghost:hover {
    background-color: var(--color-gray-100);
    color: var(--color-text-primary);
    text-decoration: none;
}

.btn--full {
    width: 100%;
}

.btn--sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-xs);
}

.btn--lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--font-size-base);
}

.btn__spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* Form Components
   ========================================================================== */

.form-group {
    margin-bottom: var(--space-6);
}

.form-group--checkbox {
    margin-bottom: var(--space-4);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.form-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-100);
}

.form-input:disabled {
    background-color: var(--color-gray-100);
    color: var(--color-text-muted);
    cursor: not-allowed;
}

.form-input-group {
    position: relative;
}

.form-input-toggle {
    position: absolute;
    right: var(--space-3);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: var(--space-1);
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast);
}

.form-input-toggle:hover {
    color: var(--color-text-primary);
}

.form-help {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    margin-top: var(--space-1);
}

.form-error {
    font-size: var(--font-size-xs);
    color: var(--color-error);
    margin-top: var(--space-1);
    display: none;
}

.form-error.show {
    display: block;
}

.form-error--general {
    margin-top: var(--space-4);
    padding: var(--space-3);
    background-color: rgba(244, 67, 54, 0.1);
    border: 1px solid rgba(244, 67, 54, 0.2);
    border-radius: var(--radius-md);
}

.form-actions {
    margin-top: var(--space-8);
}

/* Checkbox Styles */
.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    cursor: pointer;
    font-size: var(--font-size-sm);
    line-height: var(--line-height-normal);
}

.checkbox-input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.checkbox-custom {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    border: 2px solid var(--color-border-dark);
    border-radius: var(--radius-sm);
    background-color: var(--color-white);
    transition: all var(--transition-fast);
    position: relative;
    margin-top: 2px;
}

.checkbox-input:checked + .checkbox-custom {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.checkbox-input:checked + .checkbox-custom::after {
    content: '';
    position: absolute;
    top: 1px;
    left: 5px;
    width: 6px;
    height: 10px;
    border: 2px solid var(--color-white);
    border-top: 0;
    border-left: 0;
    transform: rotate(45deg);
}

.checkbox-input:focus + .checkbox-custom {
    box-shadow: 0 0 0 3px var(--color-primary-100);
}

.checkbox-text {
    color: var(--color-text-primary);
}

/* Card Components
   ========================================================================== */

.card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: box-shadow var(--transition-fast);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card__header {
    padding: var(--space-6);
    border-bottom: 1px solid var(--color-border-light);
}

.card__content {
    padding: var(--space-6);
}

.card__footer {
    padding: var(--space-6);
    border-top: 1px solid var(--color-border-light);
    background-color: var(--color-background-secondary);
}

/* Modal Components
   ========================================================================== */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
}

.modal__backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: var(--z-modal-backdrop);
}

.modal__content {
    position: relative;
    background-color: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    z-index: var(--z-modal);
}

.modal__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-6);
    border-bottom: 1px solid var(--color-border-light);
}

.modal__title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin: 0;
}

.modal__close {
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.modal__close:hover {
    color: var(--color-text-primary);
    background-color: var(--color-gray-100);
}

.modal__body {
    padding: var(--space-6);
}

.modal__footer {
    display: flex;
    gap: var(--space-3);
    justify-content: flex-end;
    padding: var(--space-6);
    border-top: 1px solid var(--color-border-light);
    background-color: var(--color-background-secondary);
}

/* Toast Notifications
   ========================================================================== */

.toast-container {
    position: fixed;
    top: var(--space-4);
    right: var(--space-4);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    max-width: 400px;
    width: 100%;
}

.toast {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--space-4);
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    animation: slideInRight 0.3s ease-out;
}

.toast--success {
    border-left: 4px solid var(--color-success);
}

.toast--error {
    border-left: 4px solid var(--color-error);
}

.toast--warning {
    border-left: 4px solid var(--color-warning);
}

.toast--info {
    border-left: 4px solid var(--color-info);
}

.toast__icon {
    flex-shrink: 0;
    margin-top: 2px;
}

.toast__content {
    flex: 1;
}

.toast__title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-1);
}

.toast__message {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    margin: 0;
}

.toast__close {
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: var(--space-1);
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast);
    flex-shrink: 0;
}

.toast__close:hover {
    color: var(--color-text-primary);
}

/* Loading Components
   ========================================================================== */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.9);
    z-index: var(--z-modal);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
}

.loading-spinner,
.spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--color-gray-200);
    border-top: 3px solid var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.spinner {
    width: 16px;
    height: 16px;
    border-width: 2px;
}

/* Animations
   ========================================================================== */

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

/* Utility Classes
   ========================================================================== */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.font-light { font-weight: var(--font-weight-light); }
.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }
.text-2xl { font-size: var(--font-size-2xl); }
.text-3xl { font-size: var(--font-size-3xl); }
.text-4xl { font-size: var(--font-size-4xl); }
.text-5xl { font-size: var(--font-size-5xl); }

.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }
.text-info { color: var(--color-info); }

.bg-primary { background-color: var(--color-primary); }
.bg-white { background-color: var(--color-white); }
.bg-gray-50 { background-color: var(--color-gray-50); }
.bg-gray-100 { background-color: var(--color-gray-100); }

.border { border: 1px solid var(--color-border); }
.border-0 { border: none; }
.border-t { border-top: 1px solid var(--color-border); }
.border-b { border-bottom: 1px solid var(--color-border); }
.border-l { border-left: 1px solid var(--color-border); }
.border-r { border-right: 1px solid var(--color-border); }

.rounded { border-radius: var(--radius-md); }
.rounded-sm { border-radius: var(--radius-sm); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-full { border-radius: var(--radius-full); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

.hidden { display: none; }
.block { display: block; }
.inline { display: inline; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }

.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }

.justify-center { justify-content: center; }
.justify-start { justify-content: flex-start; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }

.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

.m-0 { margin: 0; }
.m-auto { margin: auto; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.ml-0 { margin-left: 0; }
.mr-0 { margin-right: 0; }

.p-0 { padding: 0; }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.pt-0 { padding-top: 0; }
.pb-0 { padding-bottom: 0; }
.pl-0 { padding-left: 0; }
.pr-0 { padding-right: 0; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }

.top-0 { top: 0; }
.bottom-0 { bottom: 0; }
.left-0 { left: 0; }
.right-0 { right: 0; }

.z-10 { z-index: 10; }
.z-20 { z-index: 20; }
.z-30 { z-index: 30; }
.z-40 { z-index: 40; }
.z-50 { z-index: 50; }

.opacity-0 { opacity: 0; }
.opacity-50 { opacity: 0.5; }
.opacity-100 { opacity: 1; }

.pointer-events-none { pointer-events: none; }
.cursor-pointer { cursor: pointer; }
.cursor-not-allowed { cursor: not-allowed; }

/* Responsive Design
   ========================================================================== */

@media (max-width: 639px) {
    .container {
        padding: 0 var(--space-4);
    }
    
    h1 {
        font-size: var(--font-size-3xl);
    }
    
    h2 {
        font-size: var(--font-size-2xl);
    }
    
    .modal__content {
        margin: var(--space-4);
        max-height: calc(100vh - 2rem);
    }
    
    .toast-container {
        left: var(--space-4);
        right: var(--space-4);
        max-width: none;
    }
}

@media (min-width: 640px) {
    .sm\:text-center { text-align: center; }
    .sm\:text-left { text-align: left; }
    .sm\:flex { display: flex; }
    .sm\:hidden { display: none; }
    .sm\:block { display: block; }
}

@media (min-width: 768px) {
    .md\:text-center { text-align: center; }
    .md\:text-left { text-align: left; }
    .md\:flex { display: flex; }
    .md\:hidden { display: none; }
    .md\:block { display: block; }
    .md\:flex-row { flex-direction: row; }
    .md\:flex-col { flex-direction: column; }
}

@media (min-width: 1024px) {
    .lg\:text-center { text-align: center; }
    .lg\:text-left { text-align: left; }
    .lg\:flex { display: flex; }
    .lg\:hidden { display: none; }
    .lg\:block { display: block; }
}

/* Landing Page Styles */

/* Header & Navigation */
.header {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 107, 107, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
    box-shadow: 0 2px 20px rgba(255, 107, 107, 0.08);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.25rem 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.75rem;
    font-weight: 800;
    background: linear-gradient(135deg, #ff6b6b, #ee5a24);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    transition: all 0.3s ease;
}

.logo img {
    width: 32px;
    height: 32px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
    margin: 0;
    padding: 0;
}

.nav-links a {
    color: #374151;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
}

.nav-links a:hover {
    color: #ff6b6b;
    background: rgba(255, 107, 107, 0.05);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0.25rem;
    left: 1rem;
    width: 0;
    height: 2px;
    background: linear-gradient(135deg, #ff6b6b, #ee5a24);
    transition: width 0.3s ease;
    border-radius: 1px;
}

.nav-links a:hover::after {
    width: calc(100% - 2rem);
}

.auth-buttons {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.btn-secondary {
    background: transparent;
    color: #ff6b6b;
    border: 2px solid rgba(255, 107, 107, 0.3);
    padding: 0.75rem 1.5rem;
    border-radius: 0.75rem;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 107, 107, 0.1);
    border-color: #ff6b6b;
    transform: translateY(-1px);
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.2);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #ff6b6b 0%, #ff4757 25%, #ff3742 50%, #ee5a24 75%, #fd79a8 100%);
    color: white;
    padding: 6rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="%23ffffff" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>') repeat;
    opacity: 0.3;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    background: linear-gradient(45deg, #ffffff, #e0e7ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.9;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.hero__actions {
    display: flex;
    gap: 1rem;
    justify-content: flex-start;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.hero__stats {
    display: flex;
    gap: 2rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.stat__number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: 0.25rem;
}

.stat__label {
    display: block;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.btn-primary {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);
    color: white;
    padding: 1.25rem 2.5rem;
    border: none;
    border-radius: 1rem;
    font-size: 1.2rem;
    font-weight: 700;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
    position: relative;
    overflow: hidden;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(255, 107, 107, 0.6);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-outline {
    background: transparent;
    color: white;
    padding: 1rem 2rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 0.75rem;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

/* Stats Section */
.stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
    background: rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    border-radius: 1rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    min-width: 150px;
    transition: transform 0.3s ease;
}

.stat:hover {
    transform: translateY(-5px);
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    display: block;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
}

.stat-rating {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.stars {
    display: flex;
    gap: 0.2rem;
}

.star {
    width: 16px;
    height: 16px;
    font-size: 16px;
}

/* Hero Emotion Preview */
.emotion-grid-preview {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.emotion-grid-preview .emotion-card {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.emotion-grid-preview .emotion-card:hover {
    transform: translateY(-5px) scale(1.1);
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
}

.emotion-card--happy {
    animation: bounce 2s infinite 0.5s;
}

.emotion-card--calm {
    animation: bounce 2s infinite 1s;
}

.emotion-card--excited {
    animation: bounce 2s infinite 1.5s;
}

.emotion-card--sad {
    animation: bounce 2s infinite 2s;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* Features Section */
.features {
    padding: 4rem 2rem;
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}

.features-container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: #1f2937;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, #1f2937, #4f46e5);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    font-size: 1.2rem;
    color: #6b7280;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: white;
    padding: 2.5rem;
    border-radius: 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e5e7eb;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #ff6b6b, #ee5a24);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(45deg, #ff6b6b, #ee5a24);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 24px;
    color: white;
    transition: transform 0.3s ease;
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 1rem;
}

.feature-description {
    color: #6b7280;
    line-height: 1.6;
    font-size: 1rem;
}

/* How It Works Section */
.how-it-works {
    padding: 4rem 2rem;
    background: #1f2937;
    color: white;
}

.how-it-works-container {
    max-width: 1200px;
    margin: 0 auto;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    margin-top: 3rem;
}

.step {
    text-align: center;
    position: relative;
}

.step-number {
    width: 80px;
    height: 80px;
    background: linear-gradient(45deg, #ff6b6b, #ee5a24);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 800;
    margin: 0 auto 2rem;
    position: relative;
    z-index: 2;
}

.step::after {
    content: '';
    position: absolute;
    top: 40px;
    left: 50%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, #4f46e5, transparent);
    z-index: 1;
}

.step:last-child::after {
    display: none;
}

.step-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: white;
}

.step-description {
    color: #d1d5db;
    line-height: 1.6;
}

/* Privacy Section */
.privacy {
    padding: 4rem 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.privacy-container {
    max-width: 800px;
    margin: 0 auto;
}

.privacy-icon {
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    font-size: 3rem;
    backdrop-filter: blur(10px);
}

.privacy h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
}

.privacy p {
    font-size: 1.2rem;
    opacity: 0.9;
    line-height: 1.6;
}

/* CTA Section */
.cta {
    padding: 4rem 2rem;
    background: white;
    text-align: center;
}

.cta-container {
    max-width: 800px;
    margin: 0 auto;
}

.cta h2 {
    font-size: 2.5rem;
    font-weight: 800;
    color: #1f2937;
    margin-bottom: 1.5rem;
    background: linear-gradient(45deg, #1f2937, #4f46e5);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cta p {
    font-size: 1.2rem;
    color: #6b7280;
    margin-bottom: 2.5rem;
    line-height: 1.6;
}

/* Footer */
.footer {
    background: #1f2937;
    color: white;
    padding: 3rem 2rem 2rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 2rem;
}

.footer-logo img {
    width: 32px;
    height: 32px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: #d1d5db;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 2rem;
    color: #9ca3af;
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .hero {
        padding: 4rem 1rem;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .stats {
        gap: 1.5rem;
    }
    
    .features {
        padding: 4rem 1rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .how-it-works {
        padding: 4rem 1rem;
    }
    
    .steps {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .step::after {
        display: none;
    }
    
    .privacy, .cta {
        padding: 4rem 1rem;
    }
    
    .privacy h2, .cta h2 {
        font-size: 2rem;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .btn-primary, .btn-outline {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }
    
    .feature-card {
        padding: 2rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* Animation Classes */
.animate-fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

.animate-fade-in-left {
    animation: fadeInLeft 0.6s ease-out;
}

.animate-fade-in-right {
    animation: fadeInRight 0.6s ease-out;
}

.animate-pulse {
    animation: pulse 2s infinite;
}

.animate-float {
    animation: float 3s ease-in-out infinite;
}

/* Scroll animations */
@media (prefers-reduced-motion: no-preference) {
    .feature-card {
        opacity: 0;
        transform: translateY(20px);
        transition: all 0.6s ease;
    }
    
    .feature-card.animate-in {
        opacity: 1;
        transform: translateY(0);
    }
    
    .step {
        opacity: 0;
        transform: translateY(20px);
        transition: all 0.6s ease;
    }
    
    .step.animate-in {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Enhanced hover effects */
.btn-primary {
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn-primary:hover::before {
    left: 100%;
}

/* Improved focus states */
.btn-primary:focus,
.btn-outline:focus,
.btn-secondary:focus {
    outline: 2px solid #4f46e5;
    outline-offset: 2px;
}

.nav-links a:focus {
    outline: 2px solid #4f46e5;
    outline-offset: 4px;
    border-radius: 4px;
}

/* Print Styles
    ========================================================================== */

@media print {
    .no-print {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .btn {
        border: 1px solid black !important;
        background: white !important;
        color: black !important;
    }
}

/* High Contrast Mode Support
   ========================================================================== */

@media (prefers-contrast: high) {
    :root {
        --color-border: #000000;
        --color-text-secondary: #000000;
        --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.2);
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
    }
}

/* Reduced Motion Support
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Focus Visible Support
   ========================================================================== */

.btn:focus-visible,
.form-input:focus-visible,
.checkbox-input:focus-visible + .checkbox-custom {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Dark Mode Support (Future Enhancement)
   ========================================================================== */

@media (prefers-color-scheme: dark) {
    /* Dark mode styles can be added here in future versions */
}