/* ═══════════════════════════════════════════════
   SELF OBSERVATION MEDITATION — Black & White Theme
   ═══════════════════════════════════════════════ */

:root {
    --bg: #000000;
    --surface: #0a0a0a;
    --border: #1a1a1a;
    --border-hover: #333333;
    --text: #ffffff;
    --text-dim: #999999;
    --text-muted: #666666;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --radius: 8px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font);
    height: 100dvh;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* ── App Container ── */
#app {
    width: 100%;
    height: 100%;
    max-width: 1000px;
    position: relative;
}

/* ── Screens ── */
.screen {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    display: flex;
    flex-direction: column;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.6s ease;
}

.screen.active {
    opacity: 1;
    pointer-events: all;
    z-index: 10;
}

.hidden {
    display: none !important;
}

/* ═══════════════════════════════════════════════
   MENU SCREEN
   ═══════════════════════════════════════════════ */

#menu-screen {
    overflow-y: auto;
    overflow-x: hidden;
    scrollbar-width: none;
}

#menu-screen::-webkit-scrollbar {
    display: none;
}

.menu-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 3rem 2rem 2rem;
    max-width: 660px;
    margin: 0 auto;
    width: 100%;
}

/* ── Header ── */
.menu-header {
    text-align: center;
    margin-bottom: 2rem;
}

h1 {
    font-size: clamp(1.8rem, 5vw, 2.8rem);
    font-weight: 200;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 0.85rem;
    color: var(--text-dim);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    font-weight: 300;
}

/* ── Intro Text ── */
.intro-text {
    text-align: center;
    margin-bottom: 2.5rem;
    max-width: 560px;
}

.intro-text p {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--text-dim);
    font-weight: 300;
}

.text-toggle-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.8rem;
    margin-top: 0.75rem;
    padding: 0.25rem 0;
    transition: color var(--transition);
    font-family: var(--font);
}

.text-toggle-btn:hover {
    color: var(--text-dim);
}

.text-toggle-btn.expanded svg {
    transform: rotate(180deg);
}

.text-toggle-btn svg {
    transition: transform var(--transition);
}

.intro-expanded {
    margin-top: 0.75rem;
    animation: fadeSlideIn 0.4s ease;
}

@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ── Level Grid ── */
.level-grid {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
    margin-bottom: 2rem;
}

.level-card {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem 1.75rem;
    text-align: left;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    overflow: hidden;
    font-family: var(--font);
}

.level-card:hover {
    border-color: var(--border-hover);
    background: #0f0f0f;
    transform: translateY(-1px);
}

.level-card:active {
    transform: translateY(0);
}

.card-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background: rgba(255, 255, 255, 0.08);
    transition: background var(--transition);
}

.level-card:hover .card-line {
    background: rgba(255, 255, 255, 0.25);
}

.level-number {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: 0.1em;
}

.level-title {
    font-size: 1.15rem;
    font-weight: 400;
    color: var(--text);
}

.level-desc {
    font-size: 0.82rem;
    color: var(--text-dim);
    line-height: 1.5;
    font-weight: 300;
}

.card-meta {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
    font-size: 0.72rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.meta-duration {
    opacity: 0.6;
}

.meta-sessions {
    opacity: 0.4;
}

.meta-time {
    opacity: 0.4;
    margin-left: auto;
}

/* ── Mastery Section ── */
.mastery-section {
    width: 100%;
    margin-bottom: 2rem;
}

.mastery-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.82rem;
    padding: 0.5rem 0;
    transition: color var(--transition);
    font-family: var(--font);
    width: 100%;
    text-align: left;
}

.mastery-toggle:hover {
    color: var(--text-dim);
}

.mastery-toggle.expanded svg {
    transform: rotate(180deg);
}

.mastery-toggle svg {
    transition: transform var(--transition);
    flex-shrink: 0;
}

.mastery-content {
    padding: 0.75rem 0;
    animation: fadeSlideIn 0.4s ease;
}

.mastery-content p {
    font-size: 0.85rem;
    line-height: 1.7;
    color: var(--text-dim);
    font-weight: 300;
    font-style: italic;
}

/* ── Footer ── */
.menu-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border);
}

.footer-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 660px;
    margin: 0 auto;
}

.footer-actions {
    display: flex;
    gap: 0.25rem;
    align-items: center;
}

.credits {
    font-size: 0.72rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.credits a {
    color: var(--text-muted);
    text-decoration: none;
    border-bottom: 1px dotted var(--text-muted);
    transition: color var(--transition);
}

.credits a:hover {
    color: var(--text-dim);
}

.icon-btn {
    background: none;
    border: 1px solid transparent;
    color: var(--text);
    cursor: pointer;
    padding: 0.5rem;
    opacity: 0.4;
    transition: all var(--transition);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    opacity: 0.8;
    border-color: var(--border);
}

/* ═══════════════════════════════════════════════
   SESSION SCREEN
   ═══════════════════════════════════════════════ */

#session-screen {
    justify-content: center;
    align-items: center;
    padding: 2rem 1.5rem;
    overflow-y: auto;
    scrollbar-width: none;
}

#session-screen::-webkit-scrollbar {
    display: none;
}

/* ── Session Header ── */
.session-header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    z-index: 20;
}

.session-level-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    font-weight: 400;
}

/* ── Observer Guide (replaces breathing guide) ── */
.observer-guide {
    margin-bottom: 1.5rem;
    margin-top: 3rem;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
}

.observer-ring {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.15);
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    transition: all 3s ease-in-out;
}

.observer-ring.active {
    border-color: rgba(255, 255, 255, 0.35);
    box-shadow: 0 0 40px rgba(255, 255, 255, 0.03);
    animation: observerPulse 8s ease-in-out infinite;
}

@keyframes observerPulse {

    0%,
    100% {
        border-color: rgba(255, 255, 255, 0.2);
        box-shadow: 0 0 30px rgba(255, 255, 255, 0.02);
    }

    50% {
        border-color: rgba(255, 255, 255, 0.4);
        box-shadow: 0 0 50px rgba(255, 255, 255, 0.05);
    }
}

.observer-label {
    font-size: 0.7rem;
    color: var(--text-dim);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    font-weight: 300;
    position: absolute;
}

/* ── Instruction Area ── */
.instruction-area {
    width: 90%;
    max-width: 580px;
    margin-bottom: 2rem;
    flex-shrink: 0;
}

.instruction-steps {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding-bottom: 50px;
}

.instruction-step {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-muted);
    font-weight: 300;
    transition: all 0.6s ease;
    opacity: 0;
    transform: translateY(8px);
    text-align: center;
}

.instruction-step.visible {
    opacity: 1;
    transform: translateY(0);
}

.instruction-step.active {
    color: var(--text);
    font-weight: 400;
}

.instruction-step.past {
    color: var(--text-dim);
    opacity: 0.6;
}

/* ── Timer Area ── */
.timer-area {
    margin-bottom: 2rem;
}

.timer-ring-container {
    position: relative;
    width: 180px;
    height: 180px;
}

.timer-ring {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.timer-ring-bg {
    fill: none;
    stroke: var(--border);
    stroke-width: 2;
}

.timer-ring-progress {
    fill: none;
    stroke: rgba(255, 255, 255, 0.2);
    stroke-width: 2;
    stroke-linecap: round;
    transition: stroke-dashoffset 1s linear;
}

.timer-inner {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.time-display {
    font-size: clamp(2.2rem, 6vw, 2.8rem);
    font-weight: 200;
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
}

.overtime-display {
    font-size: 0.82rem;
    color: var(--text-dim);
    font-weight: 300;
    margin-top: 0.25rem;
}

/* ── Controls ── */
.controls {
    display: flex;
    gap: 0.75rem;
    flex-shrink: 0;
}

.control-btn {
    background: transparent;
    border: 1px solid var(--border-hover);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 400;
    padding: 0.65rem 2rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition);
    letter-spacing: 0.05em;
}

.control-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.3);
}

.control-btn.primary {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
}

.control-btn.primary:hover {
    background: rgba(255, 255, 255, 0.14);
}

.control-btn.finish {
    border-color: rgba(255, 255, 255, 0.1);
    color: var(--text-dim);
}

.control-btn.danger {
    border-color: #441111;
    color: #cc4444;
}

.control-btn.danger:hover {
    background: rgba(204, 68, 68, 0.1);
}

.control-btn.modal-save {
    width: 100%;
    margin-top: 1rem;
}

/* ── Modals ── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(12px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal {
    background: #0a0a0a;
    border: 1px solid var(--border-hover);
    border-radius: 12px;
    padding: 2rem;
    max-width: 420px;
    width: 90%;
}

.modal h2 {
    font-size: 1.1rem;
    font-weight: 400;
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
}

.modal h3 {
    font-size: 0.82rem;
    color: var(--text-dim);
    font-weight: 500;
    margin-bottom: 0.75rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* ── Settings ── */
.setting-group {
    margin-bottom: 1rem;
}

.setting-group label,
.setting-group span {
    font-size: 0.85rem;
    color: var(--text-dim);
    font-weight: 300;
}

.setting-group input[type="number"] {
    display: block;
    width: 100%;
    margin-top: 0.5rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.6rem 0.75rem;
    color: var(--text);
    font-family: var(--font);
    font-size: 0.9rem;
}

.toggle-group {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.toggle {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 22px;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background: #1a1a1a;
    border: 1px solid var(--border);
    border-radius: 22px;
    transition: var(--transition);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    height: 16px;
    width: 16px;
    left: 2px;
    bottom: 2px;
    background: var(--text-muted);
    border-radius: 50%;
    transition: var(--transition);
}

.toggle input:checked+.toggle-slider {
    border-color: var(--border-hover);
}

.toggle input:checked+.toggle-slider::before {
    transform: translateX(18px);
    background: var(--text);
}

/* ── Stats ── */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 1.3rem;
    font-weight: 300;
    margin-bottom: 0.25rem;
    font-variant-numeric: tabular-nums;
}

.stat-label {
    font-size: 0.68rem;
    color: var(--text-muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    font-weight: 400;
}

.stats-breakdown {
    margin-bottom: 1.25rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border);
}

.breakdown-row {
    display: flex;
    justify-content: space-between;
    padding: 0.4rem 0;
    font-size: 0.82rem;
    color: var(--text-dim);
    font-weight: 300;
}

.modal-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.modal-actions .control-btn {
    flex: 1;
}

/* ── Stats Modal Scrollable ── */
.stats-modal {
    max-height: 85vh;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: #222 transparent;
}

.stats-modal::-webkit-scrollbar {
    width: 4px;
}

.stats-modal::-webkit-scrollbar-track {
    background: transparent;
}

.stats-modal::-webkit-scrollbar-thumb {
    background: #222;
    border-radius: 2px;
}

/* ── Session History ── */
.history-entry {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.78rem;
    color: var(--text-dim);
    font-weight: 300;
}

.history-entry:last-child {
    border-bottom: none;
}

.history-entry .h-level {
    color: var(--text-dim);
    min-width: 80px;
}

.history-entry .h-duration {
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

.history-entry .h-date {
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
    text-align: right;
    min-width: 90px;
}

.empty-history {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 300;
    font-style: italic;
    padding: 0.5rem 0;
}

/* ── Toast ── */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: #1a1a1a;
    border: 1px solid var(--border-hover);
    color: var(--text-dim);
    padding: 0.6rem 1.4rem;
    border-radius: var(--radius);
    font-size: 0.82rem;
    font-family: var(--font);
    z-index: 200;
    opacity: 0;
    transition: all 0.3s ease;
    pointer-events: none;
}

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

/* ═══════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════ */

@media (max-width: 600px) {
    h1 {
        font-size: 1.8rem;
    }

    .level-card {
        padding: 1.25rem 1.25rem;
    }

    .timer-ring-container {
        width: 150px;
        height: 150px;
    }

    .time-display {
        font-size: 2.2rem;
    }

    .observer-ring {
        width: 80px;
        height: 80px;
    }

    .instruction-step {
        font-size: 0.9rem;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
    }

    .stat-value {
        font-size: 1.1rem;
    }

    .modal {
        padding: 1.5rem;
        margin: 0 0.75rem;
    }
}

@media (max-width: 380px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* ── Utility ── */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}