/* Meditation App - Zen Minimalist */

:root {
    --font: -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
    --bg: linear-gradient(145deg, #0d0d0d 0%, #1a1520 45%, #2d1f3d 75%, #1e2a38 100%);
    --settings-bg: linear-gradient(160deg, #050508 0%, #0a0f1a 40%, #0f1628 70%, #1a1833 100%);
    --text: rgba(255, 255, 255, 0.87);
    --text-dim: rgba(255, 255, 255, 0.4);
    --text-faint: rgba(255, 255, 255, 0.2);
    --ring-track-outer: rgba(20, 184, 166, 0.6);
    --ring-track-inner: rgba(196, 181, 253, 0.6);
    --ring-outer: #14b8a6;
    --ring-inner: #c4b5fd;
    --accent: rgba(255, 255, 255, 0.87);
    /* Use smallest available viewport unit to avoid iOS PWA toolbar gaps */
    --app-height: 100vh;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html,
body {
    width: 100%;
    height: 100vh;
    overflow: hidden;
    overscroll-behavior: none;
    touch-action: none;
}

html {
    background: var(--bg);
}

body {
    position: fixed;
    font-family: var(--font);
    color: var(--text);
    -webkit-font-smoothing: antialiased;
    user-select: none;
}

.hidden { display: none !important; }

/* ==================== MAIN SCREEN ==================== */

.screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
    touch-action: manipulation;
    /* Background gradient is on html/body to extend beyond safe areas */
}

/* Settings button */
.settings-btn {
    position: absolute;
    top: calc(env(safe-area-inset-top, 16px) + 16px);
    right: calc(env(safe-area-inset-right, 16px) + 16px);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-dim);
    background: none;
    border: none;
    cursor: pointer;
    transition: opacity 0.3s;
}

.settings-btn:active {
    opacity: 0.5;
}

.settings-btn.hidden-during-session {
    opacity: 0;
    pointer-events: none;
}

/* ==================== RINGS ==================== */

.rings-container {
    position: relative;
    width: 260px;
    height: 260px;
    margin-bottom: 48px;
}

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

.ring-track {
    fill: none;
    stroke-width: 14;
}

.ring-track-outer {
    stroke: var(--ring-track-outer);
}

.ring-track-inner {
    stroke: var(--ring-track-inner);
}

.ring {
    fill: none;
    stroke-width: 14;
    transition: stroke-dashoffset 0.1s linear;
}

.ring-outer {
    stroke-dasharray: 565.49;
    stroke-dashoffset: 565.49;
}

.ring-inner {
    stroke-dasharray: 414.69;
    stroke-dashoffset: 414.69;
}

/* Timer */
.timer-container {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.timer-display {
    font-size: 36px;
    font-weight: 600;
    letter-spacing: 1px;
    font-variant-numeric: tabular-nums;
}

.timer-inactive .timer-display {
    opacity: 0.8;
}

.timer-paused .timer-display {
    animation: breathe 5s ease-in-out infinite;
}

@keyframes breathe {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* ==================== BUTTONS ==================== */

.btn-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.play-btn,
.reset-btn {
    padding: 16px 32px;
    background: none;
    border: 1px solid var(--text-dim);
    border-radius: 100px;
    cursor: pointer;
    transition: border-color 0.3s, transform 0.2s, opacity 0.3s;
}

@media (hover: hover) {
    .play-btn:hover,
    .reset-btn:hover {
        border-color: var(--text);
    }
}

.play-btn:active,
.reset-btn:active {
    transform: scale(0.97);
    opacity: 0.8;
}

.play-btn span,
.reset-btn span {
    font-family: var(--font);
    font-size: 14px;
    font-weight: 400;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text);
}

.reset-btn {
    opacity: 0;
    pointer-events: none;
}

.reset-btn.visible {
    opacity: 1;
    pointer-events: auto;
}

/* ==================== SETTINGS ==================== */

.settings-screen {
    position: fixed;
    inset: 0;
    background: var(--settings-bg);
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 100;
    /* Scrolling moved to .settings-content so background stays fixed */
}

.settings-screen::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(20, 184, 166, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 80% 100%, rgba(196, 181, 253, 0.06) 0%, transparent 50%);
    pointer-events: none;
}

.settings-screen.open {
    transform: translateX(0);
}

.settings-content {
    position: relative;
    height: 100%;
    background: transparent;
    display: flex;
    flex-direction: column;
    padding: calc(env(safe-area-inset-top, 0px) + 24px) calc(env(safe-area-inset-right, 0px) + 28px) calc(env(safe-area-inset-bottom, 0px) + 32px) calc(env(safe-area-inset-left, 0px) + 28px);
    max-width: 480px;
    margin: 0 auto;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    scrollbar-width: none;
    touch-action: pan-y;
}

.settings-content::-webkit-scrollbar {
    display: none;
}

.settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 56px;
    opacity: 0;
    transform: translateY(-10px);
    animation: settingsFadeIn 0.5s ease-out 0.1s forwards;
}

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

.settings-header h1 {
    font-size: 24px;
    font-weight: 300;
    letter-spacing: 1px;
    color: var(--text);
}

.close-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    border-radius: 50%;
    transition: background 0.3s, color 0.3s, transform 0.2s;
}

@media (hover: hover) {
    .close-btn:hover {
        background: rgba(255, 255, 255, 0.05);
        color: var(--text);
    }
}

.close-btn:active {
    transform: scale(0.92);
}

/* Settings groups */
.settings-groups {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 36px;
}

.settings-group {
    padding: 24px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 16px;
    opacity: 0;
    transform: translateY(16px);
    animation: settingsFadeIn 0.5s ease-out forwards;
}

.settings-group:nth-child(1) { animation-delay: 0.15s; }
.settings-group:nth-child(2) { animation-delay: 0.25s; }
.settings-group:nth-child(3) { animation-delay: 0.35s; }

.setting-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.setting-row label {
    font-size: 15px;
    font-weight: 400;
    letter-spacing: 0.5px;
    color: var(--text);
}

.setting-value {
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 1px;
    color: var(--ring-outer);
    font-variant-numeric: tabular-nums;
    background: rgba(20, 184, 166, 0.1);
    padding: 6px 12px;
    border-radius: 20px;
    min-width: 70px;
    text-align: center;
}

.setting-hint {
    margin-top: 16px;
    font-size: 12px;
    color: var(--text-faint);
    letter-spacing: 0.3px;
    padding-left: 2px;
}

.group-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--ring-inner);
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(196, 181, 253, 0.15);
}

.toggle-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.toggle-row:last-of-type {
    border-bottom: none;
    padding-bottom: 0;
}

.toggle-row span {
    font-size: 15px;
    color: var(--text);
    letter-spacing: 0.3px;
}

/* Slider */
.slider {
    -webkit-appearance: none;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, rgba(20, 184, 166, 0.2) 0%, rgba(196, 181, 253, 0.2) 100%);
    border-radius: 2px;
    outline: none;
    transition: background 0.3s;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: linear-gradient(135deg, #fff 0%, #e0e0e0 100%);
    cursor: pointer;
    box-shadow:
        0 2px 8px rgba(0, 0, 0, 0.3),
        0 0 0 4px rgba(20, 184, 166, 0.15);
    transition: box-shadow 0.2s, transform 0.2s;
}

@media (hover: hover) {
    .slider::-webkit-slider-thumb:hover {
        box-shadow:
            0 2px 12px rgba(0, 0, 0, 0.4),
            0 0 0 6px rgba(20, 184, 166, 0.25);
    }
}

.slider::-webkit-slider-thumb:active {
    transform: scale(1.1);
}

.slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: linear-gradient(135deg, #fff 0%, #e0e0e0 100%);
    border: none;
    cursor: pointer;
    box-shadow:
        0 2px 8px rgba(0, 0, 0, 0.3),
        0 0 0 4px rgba(20, 184, 166, 0.15);
}

/* Toggle */
.toggle {
    -webkit-appearance: none;
    width: 52px;
    height: 28px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.08);
    position: relative;
    cursor: pointer;
    transition: background 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.toggle::before {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--text-dim);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.3s;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.toggle:checked {
    background: linear-gradient(135deg, rgba(20, 184, 166, 0.4) 0%, rgba(13, 148, 136, 0.4) 100%);
    border-color: rgba(20, 184, 166, 0.3);
}

.toggle:checked::before {
    transform: translateX(24px);
    background: var(--ring-outer);
    box-shadow:
        0 2px 4px rgba(0, 0, 0, 0.2),
        0 0 12px rgba(20, 184, 166, 0.4);
}

/* Preview buttons */
.preview-buttons {
    margin-top: 48px;
    display: flex;
    gap: 12px;
    width: 100%;
    opacity: 0;
    transform: translateY(16px);
    animation: settingsFadeIn 0.5s ease-out 0.45s forwards;
}

.preview-btn {
    flex: 1;
    padding: 16px 12px;
    font-size: 11px;
    font-weight: 500;
    font-family: inherit;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--text-dim);
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.preview-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(20, 184, 166, 0.1) 0%, rgba(196, 181, 253, 0.1) 100%);
    opacity: 0;
    transition: opacity 0.3s;
}

@media (hover: hover) {
    .preview-btn:hover {
        border-color: rgba(20, 184, 166, 0.3);
        color: var(--text);
    }

    .preview-btn:hover::before {
        opacity: 1;
    }
}

.preview-btn:active {
    transform: scale(0.97);
    border-color: var(--ring-outer);
}

.preview-btn span {
    position: relative;
    z-index: 1;
}

/* Completed state */
.completed .ring {
    opacity: 0.5;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation: none !important;
        transition: none !important;
    }
}