/* ================================
   CSS Reset & Root Variables
   ================================ */

:root {
    /* Warm, Natural Color Palette */
    --color-bg: #1a1816;
    --color-surface: #252220;
    --color-surface-elevated: #2f2c29;
    --color-text: #e8e3dd;
    --color-text-secondary: #b8afa6;
    --color-text-muted: #8a8075;
    --color-primary: #c9a77c;
    --color-primary-light: #d9ba96;
    --color-secondary: #9b8b7e;
    --color-accent: #a88f7a;
    --color-border: #3a3630;
    --color-border-light: #4a443d;
    --color-overlay: rgba(26, 24, 22, 0.92);

    /* Typography - Natural, Human Fonts */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', 'Menlo', 'Monaco', 'Courier New', monospace;

    /* Reduced Spacing for Viewport Fit */
    --spacing-xs: 0.375rem;
    --spacing-sm: 0.625rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.25rem;
    --spacing-xl: 1.75rem;
    --spacing-2xl: 2.5rem;

    /* Animation */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.1);
    --shadow-md: 0 3px 6px -1px rgb(0 0 0 / 0.2);
    --shadow-lg: 0 8px 12px -3px rgb(0 0 0 / 0.25);
    --shadow-xl: 0 16px 20px -5px rgb(0 0 0 / 0.3);
}

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

body {
    font-family: var(--font-primary);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    overflow-x: hidden;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ================================
   Modal Styles
   ================================ */

.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.modal.active {
    opacity: 1;
    pointer-events: all;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: var(--color-overlay);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.modal-container {
    position: relative;
    width: 90%;
    max-width: 560px;
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-radius: 12px;
    box-shadow: var(--shadow-xl);
    transform: translateY(20px) scale(0.95);
    transition: transform var(--transition-slow);
    animation: modalSlideIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(40px) scale(0.9);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

.modal-close {
    position: absolute;
    top: 0.875rem;
    right: 0.875rem;
    width: 36px;
    height: 36px;
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    z-index: 10;
}

.modal-close:hover {
    background: var(--color-border-light);
    border-color: var(--color-primary);
}

.modal-close svg {
    color: var(--color-text-secondary);
}

.modal-content {
    padding: var(--spacing-xl) var(--spacing-lg);
}

.modal-badge {
    display: inline-block;
    background: var(--color-primary);
    color: var(--color-bg);
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    padding: 0.375rem 0.75rem;
    margin-bottom: var(--spacing-md);
    border-radius: 4px;
}

.modal-title {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 600;
    line-height: 1.25;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.modal-body {
    margin-bottom: var(--spacing-lg);
}

.modal-intro {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.modal-section {
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.info-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.info-list li {
    font-size: 0.875rem;
    padding-left: var(--spacing-md);
    position: relative;
    color: var(--color-text-secondary);
}

.info-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 600;
}

.highlight {
    color: var(--color-text);
    font-weight: 500;
}

.method-text {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.cta-button {
    width: 100%;
    background: var(--color-primary);
    color: var(--color-bg);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-primary);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    border-radius: 8px;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.cta-button:hover {
    background: var(--color-primary-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* ================================
   Main Container
   ================================ */

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-sm);
}

/* ================================
   Header
   ================================ */

.header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.site-title {
    font-size: clamp(1.375rem, 3.5vw, 1.875rem);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.header-meta {
    display: flex;
    gap: var(--spacing-xl);
    justify-content: center;
    flex-wrap: wrap;
}

.meta-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.125rem;
}

.meta-label {
    font-size: 0.6875rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.meta-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary-light);
}

/* ================================
   Visualization Section - COMPACT & CENTERED
   ================================ */

.viz-section {
    margin-bottom: var(--spacing-lg);
}

.phone-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-display {
    width: 100%;
    max-width: 340px;
}

.phone-screen {
    position: relative;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
}

.phone-screen:hover {
    box-shadow: var(--shadow-xl);
    border-color: var(--color-border-light);
}

.phone-image {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 6px;
}

/* ================================
   Controls
   ================================ */

.controls {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.control-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text-secondary);
    font-family: var(--font-primary);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.control-btn:hover:not(:disabled) {
    background: var(--color-surface-elevated);
    color: var(--color-text);
    border-color: var(--color-primary);
}

.control-btn:active:not(:disabled) {
    transform: scale(0.98);
}

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

.control-btn.primary:hover:not(:disabled) {
    background: var(--color-primary-light);
    border-color: var(--color-primary-light);
}

.control-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.control-btn svg {
    width: 16px;
    height: 16px;
}

/* ================================
   Status Bar
   ================================ */

.status-bar {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 0.75rem;
}

.status-dot {
    width: 7px;
    height: 7px;
    background: var(--color-primary);
    border-radius: 50%;
    animation: statusPulse 2s ease-in-out infinite;
}

@keyframes statusPulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(0.85);
    }
}

.status-text {
    color: var(--color-text-secondary);
}

.status-bar.playing .status-dot {
    background: var(--color-secondary);
    animation: statusPulse 1s ease-in-out infinite;
}

.status-bar.paused .status-dot {
    background: #c9a77c;
    animation: none;
}

/* ================================
   Collapsible Stats Section
   ================================ */

.stats-section {
    max-width: 700px;
    margin: 0 auto;
}

.stats-toggle {
    width: 100%;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    transition: all var(--transition-base);
    color: var(--color-text);
}

.stats-toggle:hover {
    background: var(--color-surface-elevated);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.stats-toggle[aria-expanded="true"] {
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
    border-bottom-color: transparent;
}

.toggle-header {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    align-items: flex-start;
}

.toggle-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-text);
}

.toggle-meta {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.meta-badge {
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--color-primary-light);
    background: rgba(201, 167, 124, 0.12);
    padding: 0.1875rem 0.4375rem;
    border-radius: 4px;
}

.toggle-icon {
    color: var(--color-text-secondary);
    transition: transform var(--transition-base);
    flex-shrink: 0;
}

.stats-toggle[aria-expanded="true"] .toggle-icon {
    transform: rotate(180deg);
}

/* Stats Content */
.stats-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-top: none;
    border-bottom-left-radius: 10px;
    border-bottom-right-radius: 10px;
}

.stats-content.expanded {
    max-height: 2000px;
}

.stats-grid {
    padding: var(--spacing-md);
}

/* Stat Card */
.stat-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: var(--spacing-md);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
}

.card-badge {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-primary-light);
    background: rgba(201, 167, 124, 0.12);
    padding: 0.3125rem 0.625rem;
    border-radius: 5px;
}

.total-time {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
    background: rgba(201, 167, 124, 0.08);
    border-left: 2px solid var(--color-primary);
    border-radius: 6px;
}

.time-label {
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--color-text-muted);
}

.time-value {
    font-size: 1.875rem;
    font-weight: 600;
    line-height: 1;
    color: var(--color-primary-light);
}

.breakdown-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.app-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.app-item {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.app-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
}

.app-time {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-secondary);
}

.app-bar-container {
    width: 100%;
    height: 5px;
    background: var(--color-surface-elevated);
    border-radius: 2.5px;
    overflow: hidden;
}

.app-bar {
    height: 100%;
    background: var(--color-primary);
    width: var(--percentage);
    border-radius: 2.5px;
    transition: width var(--transition-slow);
    animation: barGrow 1s ease-out;
}

@keyframes barGrow {
    from { width: 0; }
    to { width: var(--percentage); }
}

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

@media (max-width: 768px) {
    .phone-display {
        max-width: 300px;
    }

    .modal-container {
        width: 95%;
    }

    .header-meta {
        gap: var(--spacing-md);
    }
}

@media (max-width: 640px) {
    .phone-display {
        max-width: 280px;
    }

    .controls {
        flex-direction: column;
    }

    .control-btn {
        width: 100%;
    }

    .stats-toggle {
        padding: var(--spacing-xs) var(--spacing-sm);
    }

    .toggle-title {
        font-size: 0.875rem;
    }

    .toggle-meta {
        flex-direction: column;
        gap: 0.125rem;
    }
}

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

.hidden {
    display: none !important;
}

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