/* ===== CSS Variables & Theme ===== */
:root {
    /* Colors - Dark Theme (Default) */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #606070;
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);

    /* Accent Colors */
    --accent-pink: #FF6B9D;
    --accent-purple: #A855F7;
    --accent-blue: #3B82F6;
    --accent-cyan: #06B6D4;
    --accent-orange: #F97316;
    --accent-green: #10B981;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--accent-pink) 0%, var(--accent-purple) 50%, var(--accent-cyan) 100%);
    --gradient-subtle: linear-gradient(135deg, rgba(168, 85, 247, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
    --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 100%);

    /* Glass Effect */
    --glass-bg: rgba(20, 20, 30, 0.6);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);

    /* Spacing */
    --sidebar-width: 280px;
    --header-height: 60px;

    /* Typography */
    --font-display: 'Instrument Serif', Georgia, serif;
    --font-heading: 'Syne', sans-serif;
    --font-body: 'DM Sans', sans-serif;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #f8f8fc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f0f0f5;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a5a;
    --text-muted: #8a8a9a;
    --border-color: rgba(0, 0, 0, 0.08);
    --border-hover: rgba(0, 0, 0, 0.12);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.08);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.9) 0%, rgba(255, 255, 255, 0.5) 100%);
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* ===== Animated Background ===== */
.bg-canvas {
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: float 20s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: var(--accent-purple);
    top: -200px;
    right: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: var(--accent-cyan);
    bottom: -150px;
    left: -100px;
    animation-delay: -5s;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: var(--accent-pink);
    top: 50%;
    left: 30%;
    animation-delay: -10s;
}

.orb-4 {
    width: 300px;
    height: 300px;
    background: var(--accent-orange);
    bottom: 20%;
    right: 20%;
    animation-delay: -15s;
}

[data-theme="light"] .orb {
    opacity: 0.3;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(50px, -50px) scale(1.1); }
    50% { transform: translate(-30px, 30px) scale(0.95); }
    75% { transform: translate(40px, 40px) scale(1.05); }
}

.grain-overlay {
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    opacity: 0.03;
    pointer-events: none;
}

/* ===== Theme Toggle ===== */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
    box-shadow: var(--glass-shadow);
}

.theme-toggle:hover {
    transform: scale(1.05);
    border-color: var(--accent-purple);
}

.theme-icon {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: var(--transition-normal);
}

.theme-icon.sun { opacity: 0; transform: rotate(-90deg) scale(0.5); }
.theme-icon.moon { opacity: 1; transform: rotate(0) scale(1); }

[data-theme="light"] .theme-icon.sun { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="light"] .theme-icon.moon { opacity: 0; transform: rotate(90deg) scale(0.5); }

/* ===== App Container ===== */
.app-container {
    position: relative;
    z-index: 1;
    display: flex;
    min-height: 100vh;
}

/* ===== Sidebar ===== */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform var(--transition-normal);
}

.sidebar.collapsed {
    transform: translateX(calc(-1 * var(--sidebar-width)));
}

.sidebar-header {
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    display: flex;
    animation: pulse 3s ease-in-out infinite;
}

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

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar-toggle {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.sidebar-toggle:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.history-header h3 {
    font-family: var(--font-heading);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.history-count {
    background: var(--gradient-primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 10px;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.history-empty {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
}

.empty-icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 12px;
    opacity: 0.5;
}

.history-empty p {
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.empty-sub {
    font-size: 0.875rem;
}

.history-item {
    padding: 12px;
    border-radius: var(--radius-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition-fast);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.history-item:hover {
    border-color: var(--accent-purple);
    background: rgba(168, 85, 247, 0.1);
}

.history-item-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.history-platform {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    padding: 2px 6px;
    border-radius: 4px;
    background: var(--gradient-primary);
    color: white;
}

.history-time {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-left: auto;
}

.history-preview {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
}

.clear-history {
    width: 100%;
    padding: 10px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.875rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition-fast);
}

.clear-history:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: #EF4444;
    color: #EF4444;
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 40px;
    transition: margin-left var(--transition-normal);
}

.sidebar.collapsed ~ .main-content {
    margin-left: 0;
}

.mobile-menu {
    display: none;
}

.header {
    margin-bottom: 40px;
}

.header-content {
    max-width: 600px;
}

.title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4rem);
    line-height: 1.1;
    margin-bottom: 16px;
}

.title-line {
    display: block;
}

.title-line.accent {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-style: italic;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 500px;
}

/* ===== Content Grid ===== */
.content-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    max-width: 1400px;
}

/* ===== Glass Card ===== */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: 24px;
    box-shadow: var(--glass-shadow);
    transition: var(--transition-normal);
}

.glass-card:hover {
    border-color: var(--border-hover);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.card-icon {
    font-size: 1.5rem;
}

.card-header h2 {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: 600;
}

.output-actions {
    margin-left: auto;
    display: flex;
    gap: 8px;
}

/* ===== Form Elements ===== */
.form-group {
    margin-bottom: 24px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Platform Grid */
.platform-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.platform-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    font-family: var(--font-body);
}

.platform-btn:hover {
    border-color: var(--accent-purple);
    background: rgba(168, 85, 247, 0.1);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.platform-btn.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
}

.platform-icon {
    display: flex;
    width: 28px;
    height: 28px;
}

.platform-name {
    font-size: 0.75rem;
    font-weight: 600;
}

/* Chip Group */
.chip-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.chip {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition-fast);
    white-space: nowrap;
}

.chip:hover {
    border-color: var(--accent-purple);
    background: rgba(168, 85, 247, 0.1);
    color: var(--text-primary);
}

.chip.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
}

.chip span {
    font-size: 1rem;
}

/* Textarea */
.textarea-wrapper {
    position: relative;
}

.content-textarea {
    width: 100%;
    min-height: 150px;
    padding: 16px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    resize: vertical;
    transition: var(--transition-fast);
}

.content-textarea::placeholder {
    color: var(--text-muted);
}

.content-textarea:focus {
    outline: none;
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.15);
}

.textarea-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 8px;
    flex-wrap: wrap;
    gap: 8px;
}

.char-count {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.quick-prompts {
    display: flex;
    gap: 6px;
}

.quick-prompt {
    padding: 4px 10px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-muted);
    font-family: var(--font-body);
    font-size: 0.75rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.quick-prompt:hover {
    border-color: var(--accent-purple);
    color: var(--accent-purple);
}

/* ===== Generate Button ===== */
.generate-btn {
    width: 100%;
    padding: 18px 32px;
    border-radius: var(--radius-lg);
    border: none;
    background: var(--gradient-primary);
    color: white;
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.generate-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(45deg, transparent, rgba(255,255,255,0.2), transparent);
    transform: translateX(-100%);
    transition: transform 0.5s ease;
}

.generate-btn:hover::before {
    transform: translateX(100%);
}

.generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 40px rgba(168, 85, 247, 0.4);
}

.generate-btn:active {
    transform: translateY(0);
}

.generate-btn.loading .btn-content {
    opacity: 0;
    visibility: hidden;
}

.generate-btn.loading .btn-loading {
    opacity: 1;
    visibility: visible;
}

.btn-content, .btn-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: var(--transition-fast);
}

.btn-loading {
    position: absolute;
    inset: 0;
    opacity: 0;
    visibility: hidden;
}

.btn-icon {
    font-size: 1.25rem;
    animation: sparkle 1.5s ease-in-out infinite;
}

@keyframes sparkle {
    0%, 100% { transform: scale(1) rotate(0deg); }
    50% { transform: scale(1.2) rotate(10deg); }
}

.loading-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255,255,255,0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== Output Section ===== */
.output-card {
    display: flex;
    flex-direction: column;
    min-height: 500px;
}

.output-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.output-placeholder {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 40px;
}

.placeholder-animation {
    position: relative;
    margin-bottom: 24px;
}

.placeholder-emoji {
    font-size: 4rem;
    animation: bounce 2s ease-in-out infinite;
}

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

.floating-emojis {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.floating-emojis span {
    position: absolute;
    font-size: 1.5rem;
    animation: orbit 4s linear infinite;
}

.floating-emojis span:nth-child(1) { animation-delay: 0s; }
.floating-emojis span:nth-child(2) { animation-delay: -1.33s; }
.floating-emojis span:nth-child(3) { animation-delay: -2.66s; }

@keyframes orbit {
    from { transform: rotate(0deg) translateX(50px) rotate(0deg); }
    to { transform: rotate(360deg) translateX(50px) rotate(-360deg); }
}

.output-placeholder h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.output-placeholder p {
    color: var(--text-muted);
}

/* Generated Content */
.generated-content {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: 24px;
    line-height: 1.8;
    white-space: pre-wrap;
    animation: fadeIn 0.5s ease;
    overflow-y: auto;
    max-height: 500px;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Action Buttons ===== */
.action-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.action-btn:hover {
    border-color: var(--accent-purple);
    color: var(--accent-purple);
    background: rgba(168, 85, 247, 0.1);
}

.action-btn.copied {
    background: var(--accent-green);
    border-color: var(--accent-green);
    color: white;
}

/* ===== Toast ===== */
.toast {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--accent-green);
    color: white;
    padding: 12px 20px;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    box-shadow: 0 10px 40px rgba(16, 185, 129, 0.3);
}

.toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* ===== Mobile Styles ===== */
.mobile-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.mobile-overlay.show {
    opacity: 1;
    visibility: visible;
}

@media (max-width: 1200px) {
    .content-grid {
        grid-template-columns: 1fr;
    }

    .output-card {
        min-height: 400px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        padding: 20px;
    }

    .mobile-menu {
        display: flex;
        width: 44px;
        height: 44px;
        align-items: center;
        justify-content: center;
        border-radius: var(--radius-md);
        border: 1px solid var(--border-color);
        background: var(--glass-bg);
        color: var(--text-primary);
        cursor: pointer;
        margin-bottom: 20px;
    }

    .mobile-overlay {
        display: block;
    }

    .header {
        margin-bottom: 24px;
    }

    .title {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .platform-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .theme-toggle {
        top: auto;
        bottom: 20px;
        right: 20px;
    }

    .chip-group {
        gap: 6px;
    }

    .chip {
        padding: 6px 10px;
        font-size: 0.8rem;
    }

    .quick-prompts {
        display: none;
    }
}

/* ===== Scrollbar Styles ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover);
}

/* ===== Selection ===== */
::selection {
    background: var(--accent-purple);
    color: white;
}