:root {
    --bg-color: #050505;
    --text-color: #f0f0f0;
    --text-muted: #888;
    --card-bg: rgba(30, 30, 30, 0.6);
    --border-color: rgba(255, 255, 255, 0.1);

    --accent-color: #0F9ED5;
    --glow-color: rgba(15, 158, 213, 0.6);
    --circle-gradient: linear-gradient(135deg, var(--accent-color) 0%, #084C66 100%);

    --font-main: "Quicksand", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 20px);
}

body.forest-theme {
    --accent-color: #2D8B7C;
    --glow-color: rgba(45, 139, 124, 0.5);
    --circle-gradient: linear-gradient(135deg, #2D8B7C 0%, #1A4D44 100%);
    --card-bg: rgba(30, 30, 30, 0.6);
}

body.zen-theme {
    --accent-color: #D4AF37;
    --glow-color: rgba(212, 175, 55, 0.5);
    --circle-gradient: linear-gradient(135deg, #D4AF37 0%, #8A6E2F 100%);
    --card-bg: rgba(30, 30, 30, 0.6);
}

* {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    -webkit-user-select: none;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    height: 100vh;
    height: 100dvh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: background-color 0.5s ease;
}

header {
    width: 100%;
    position: relative;
    padding: 12px 15px 8px 15px;
    flex-shrink: 0;
    transition: opacity 0.5s ease, height 0.5s ease, padding 0.5s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 20;
    min-height: 60px;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

h1 {
    font-weight: 700;
    font-size: 1.8rem;
    margin: 0;
    display: flex;
    gap: 5px;
}

#header-breath { color: var(--accent-color); text-shadow: 0 0 5px var(--glow-color); }
#header-buddy { color: var(--text-color); }

:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 3px;
}

.app-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-grow: 1;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    padding: 0 15px;
    padding-top: var(--safe-area-top);
    overflow: hidden;
}

.session-info {
    display: flex;
    justify-content: space-between;
    width: 100%;
    padding: 20px 20px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s ease;
    position: absolute;
    top: calc(var(--safe-area-top) + 12px);
    left: 0;
    right: 0;
    max-width: 600px;
    margin: 0 auto;
    z-index: 10;
}

.info-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    font-size: 0.8rem;
    color: rgba(255,255,255,0.6);
}

.info-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    font-variant-numeric: tabular-nums;
}

.controls-container {
    width: 100%;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 24px;
    padding: 20px;
    border: 1px solid var(--border-color);
    transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1), opacity 0.5s, height 0.5s ease, margin 0.5s ease;
    display: flex;
    flex-direction: column;
    gap: 16px;
    z-index: 2;
    margin-top: 12px;
    flex-shrink: 0;
}

.presets-row {
    display: flex;
    gap: 8px;
}

.btn-preset {
    flex: 1;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.4);
    padding: 12px 0;
    border-radius: 30px; 
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s;
    font-family: var(--font-main);
}

.btn-preset.active {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: #fff;
    box-shadow: 0 0 15px var(--glow-color);
}

.preset-description {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
    line-height: 1.4;
    min-height: 2.5em;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.phases-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.control-pill {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: transparent;
    border: 1px solid var(--border-color); 
    border-radius: 40px;
    padding: 4px;
    height: 56px;
    transition: opacity 0.3s;
}

.control-pill.full-width { grid-column: span 2; }

.control-pill.disabled {
    opacity: 0.5;
    background: rgba(255,255,255,0.02);
    border-color: rgba(255,255,255,0.05);
    pointer-events: none;
}

.pill-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.03);
    color: rgba(255, 255, 255, 0.8);
    font-family: var(--font-main);
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 0 0 2px;
}

.pill-btn:active { transform: scale(0.9); background: rgba(255,255,255,0.1); }

.pill-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-grow: 1;
}

.pill-label {
    font-size: 0.65rem;
    color: rgba(255, 255, 255, 0.5);
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.pill-value {
    font-size: 1.1rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

@keyframes pop { 50% { transform: scale(1.2); color: var(--accent-color); } }
.pop { animation: pop 0.2s ease-out; }

.visual-area {
    flex: 1 1 auto;
    min-height: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    position: relative;
    transition: transform 0.5s ease;
    padding-bottom: var(--safe-area-bottom);
}

.circle-wrapper {
    width: 220px;
    max-width: 35vw;
    aspect-ratio: 1 / 1;
    height: auto;
    flex-shrink: 1;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    cursor: pointer;
    pointer-events: auto;
    -webkit-tap-highlight-color: transparent;
    transition: width 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.breathing-circle {
    width: 100%;
    height: 100%;
    background: var(--circle-gradient);
    border-radius: 50%;
    position: absolute;
    box-shadow: 0 0 35px var(--glow-color);
    transform: scale(1);
    will-change: transform;
    transition: box-shadow 0.3s;
}

.breathing-circle.idle { animation: idlePulse 3s infinite ease-in-out; }

@keyframes idlePulse {
    0% { transform: scale(1); opacity: 0.9; }
    50% { transform: scale(1.05); opacity: 1; box-shadow: 0 0 45px var(--glow-color); }
    100% { transform: scale(1); opacity: 0.9; }
}

.circle-text-container {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    z-index: 10;
}

.status-text {
    font-family: var(--font-main);
    font-size: 1.4rem;
    font-weight: 300;
    letter-spacing: 0.5px;
    text-transform: none;
    text-shadow: 0 2px 15px rgba(0,0,0,0.6);
    margin-bottom: 5px;
    text-align: center;
    line-height: 1.2;
}

.phase-timer {
    font-size: 2rem;
    font-weight: 300;
    opacity: 1;
    font-variant-numeric: tabular-nums;
}

.fade-num { animation: fadeInNum 1s ease-out; }
@keyframes fadeInNum {
    from { opacity: 0.4; }
    to { opacity: 1; }
}

body.active header {
    opacity: 0;
    pointer-events: none;
    height: 0;
    padding: 0;
    min-height: 0;
    overflow: hidden;
}

body.active .controls-container {
    opacity: 0;
    pointer-events: none;
    transform: translateY(-50px);
    height: 0;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

body.active .session-info { opacity: 1; }

body.active .visual-area {
    flex-grow: 1;
    justify-content: center;
    padding-bottom: 0;
}

/*
 * Scale is 1.5x. Max base width of 60vw * 1.5 = 90vw,
 * leaving 5% margin per side on all screens.
 */
body.active .circle-wrapper {
    width: 280px;
    max-width: 60vw;
}

#floatingStopBtn {
    position: absolute;
    bottom: var(--safe-area-bottom);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: rgba(255, 59, 48, 0.2);
    backdrop-filter: blur(10px);
    color: #ff453a;
    border: 1px solid rgba(255, 59, 48, 0.4);
    padding: 16px 48px;
    border-radius: 40px;
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    z-index: 100;
    opacity: 0;
    transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    cursor: pointer;
    white-space: nowrap;
}

#floatingStopBtn.visible { 
    opacity: 1; 
    transform: translateX(-50%) translateY(-20px);
    pointer-events: auto;
}

#floatingStopBtn.completed-state {
    background: rgba(15, 158, 213, 0.2);
    color: var(--accent-color);
    border-color: var(--accent-color);
}

@media (max-width: 380px), (max-height: 650px) {
    header {
        min-height: 40px;
        padding: 10px 15px 5px 15px;
    }
    h1 { font-size: 1.5rem; }

    .controls-container {
        padding: 12px;
        gap: 8px;
    }

    .preset-description {
        min-height: auto;
        padding-bottom: 8px;
    }

    .control-pill {
        height: 48px;
        padding: 3px;
    }
    
    .pill-btn {
        width: 38px;
        height: 38px;
        font-size: 1rem;
    }
    
    .pill-label { font-size: 0.6rem; }
    .pill-value { font-size: 1rem; }

    .phases-grid {
        grid-template-columns: 1fr;
        gap: 6px;
    }
    
    #pill-in { order: 1; }
    #pill-hold { order: 2; }
    #pill-out { order: 3; }
    #pill-hold2 { order: 4; }

    .control-pill.full-width {
       order: 5;
        grid-column: span 1;
}

    .visual-area {
        padding-bottom: 10px;
    }

    .circle-wrapper {
        width: 140px;
    }

    body.active .visual-area {
        padding-bottom: 0;
    }
}

/*
 * Reduce only decorative motion. The breathing circle's scale transition is the
 * functional guidance of the app, so it is deliberately left untouched.
 */
@media (prefers-reduced-motion: reduce) {
    .breathing-circle.idle { animation: none; }
    .pop { animation: none; }
    .fade-num { animation: none; }
}