/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
    --primary: #6ee7f7;
    --primary-dark: #22d3ee;
    --accent: #818cf8;
    --accent-dark: #6366f1;
    --success: #34d399;
    --warning: #f97316;
    --danger: #ef4444;

    --bg: #0b1120;
    --bg-card: rgba(255,255,255,0.04);
    --bg-card-hover: rgba(255,255,255,0.07);
    --border: rgba(255,255,255,0.08);
    --border-strong: rgba(255,255,255,0.14);

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;

    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 8px 32px rgba(0,0,0,0.4);
    --shadow-lg: 0 20px 60px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 40px rgba(110,231,247,0.15);

    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.6s ease;

    --interval-minutes: 50;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Outfit', 'Malgun Gothic', sans-serif;
    background: var(--bg);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* ============================================
   Animated Background Blobs
   ============================================ */
.bg-blob {
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.12;
    pointer-events: none;
    animation: blobFloat 12s ease-in-out infinite;
    z-index: 0;
}

.blob-1 {
    width: 500px; height: 500px;
    background: radial-gradient(circle, #6ee7f7 0%, transparent 70%);
    top: -150px; left: -100px;
    animation-delay: 0s;
}

.blob-2 {
    width: 400px; height: 400px;
    background: radial-gradient(circle, #818cf8 0%, transparent 70%);
    bottom: -100px; right: -80px;
    animation-delay: -4s;
}

.blob-3 {
    width: 300px; height: 300px;
    background: radial-gradient(circle, #34d399 0%, transparent 70%);
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -8s;
}

@keyframes blobFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33%       { transform: translate(30px, -30px) scale(1.05); }
    66%       { transform: translate(-20px, 20px) scale(0.95); }
}

/* ============================================
   Layout
   ============================================ */
.app-wrapper {
    position: relative;
    z-index: 1;
    max-width: 480px;
    margin: 0 auto;
    padding: 0 16px 32px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============================================
   Header
   ============================================ */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0 16px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-icon { font-size: 22px; }

.logo-text {
    font-size: 18px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.3px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.streak-badge {
    display: flex;
    align-items: center;
    gap: 4px;
    background: rgba(249,115,22,0.15);
    border: 1px solid rgba(249,115,22,0.3);
    border-radius: 20px;
    padding: 4px 10px;
    font-size: 13px;
    font-weight: 600;
    color: var(--warning);
    cursor: default;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.streak-badge:hover {
    transform: scale(1.05);
    box-shadow: 0 0 12px rgba(249,115,22,0.3);
}

.streak-icon { font-size: 14px; }
.streak-label { color: var(--text-secondary); font-weight: 400; }

.icon-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    width: 38px; height: 38px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
}

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

.icon-btn:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-strong);
    color: var(--text-primary);
    transform: rotate(20deg);
}

/* ============================================
   Timer Card
   ============================================ */
.timer-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 28px 24px;
    margin-bottom: 20px;
    position: relative;
    overflow: hidden;
    transition: box-shadow var(--transition-slow);
}

.timer-card.running {
    border-color: rgba(110,231,247,0.25);
    box-shadow: var(--shadow-glow);
}

.timer-card.alert-state {
    border-color: rgba(249,115,22,0.4);
    box-shadow: 0 0 40px rgba(249,115,22,0.2);
}

.timer-card-glow {
    position: absolute;
    top: -60px; left: 50%;
    transform: translateX(-50%);
    width: 200px; height: 200px;
    background: radial-gradient(circle, rgba(110,231,247,0.15) 0%, transparent 70%);
    pointer-events: none;
    transition: opacity var(--transition-slow);
    opacity: 0;
}

.timer-card.running .timer-card-glow { opacity: 1; }

/* Status Pill */
.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(255,255,255,0.06);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 5px 12px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.3px;
    margin-bottom: 16px;
    transition: all var(--transition-base);
}

.status-dot {
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--text-muted);
    transition: background var(--transition-base);
}

.status-pill.running {
    background: rgba(110,231,247,0.1);
    border-color: rgba(110,231,247,0.25);
    color: var(--primary);
}

.status-pill.running .status-dot {
    background: var(--primary);
    box-shadow: 0 0 8px var(--primary);
    animation: pulse 1.5s infinite;
}

.status-pill.alert {
    background: rgba(249,115,22,0.1);
    border-color: rgba(249,115,22,0.3);
    color: var(--warning);
}

.status-pill.alert .status-dot {
    background: var(--warning);
    box-shadow: 0 0 8px var(--warning);
    animation: pulse 0.8s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50%       { opacity: 0.6; transform: scale(0.85); }
}

/* Exercise Info */
.exercise-info { margin-bottom: 20px; }

.exercise-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
    line-height: 1.3;
}

.exercise-desc {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 400;
}

/* ============================================
   Circular Timer
   ============================================ */
.circular-timer-container {
    position: relative;
    width: 200px; height: 200px;
    margin: 0 auto 24px;
}

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

.timer-track {
    fill: none;
    stroke: rgba(255,255,255,0.06);
    stroke-width: 10;
}

.timer-progress {
    fill: none;
    stroke: url(#timerGradient);
    stroke-width: 10;
    stroke-linecap: round;
    transition: stroke-dashoffset 1s linear, stroke var(--transition-slow);
}

.timer-inner {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    pointer-events: none;
}

.timer-display {
    font-size: 40px;
    font-weight: 800;
    letter-spacing: -1px;
    line-height: 1;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: all var(--transition-base);
}

.timer-display.alert-mode {
    background: linear-gradient(135deg, var(--warning), var(--danger));
    -webkit-background-clip: text;
    background-clip: text;
    animation: timerPulse 0.8s infinite;
}

@keyframes timerPulse {
    0%, 100% { transform: scale(1); }
    50%       { transform: scale(1.04); }
}

.timer-label {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 500;
    margin-top: 4px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

/* ============================================
   Action Buttons
   ============================================ */
.action-buttons {
    display: flex;
    gap: 12px;
    align-items: center;
}

.btn-main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--primary-dark), var(--accent-dark));
    color: #fff;
    border: none;
    padding: 14px 24px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    font-family: 'Outfit', sans-serif;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 4px 20px rgba(110,231,247,0.2);
    position: relative;
    overflow: hidden;
}

.btn-main::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,0);
    transition: background var(--transition-fast);
}

.btn-main:hover::after { background: rgba(255,255,255,0.1); }

.btn-main:active { transform: scale(0.98); }

.btn-main.stop {
    background: linear-gradient(135deg, #ef4444, #b91c1c);
    box-shadow: 0 4px 20px rgba(239,68,68,0.25);
}

.btn-icon { width: 18px; height: 18px; flex-shrink: 0; }

.btn-secondary {
    width: 50px; height: 50px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.btn-secondary svg { width: 18px; height: 18px; }

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-strong);
    color: var(--text-primary);
    transform: rotate(-30deg);
}

.btn-secondary:active { transform: rotate(-30deg) scale(0.95); }

/* ============================================
   Exercise Cards
   ============================================ */
.exercises-section { margin-bottom: 20px; }

.section-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.exercise-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    padding-bottom: 8px;
}

.exercise-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    width: 100%;
    transition: all var(--transition-base);
    cursor: pointer;
}

.exercise-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-strong);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.exercise-card.active {
    border-color: rgba(110,231,247,0.4);
    box-shadow: 0 0 20px rgba(110,231,247,0.1);
}

.exercise-card-img {
    position: relative;
    height: 110px;
    background: rgba(255,255,255,0.03);
    overflow: hidden;
}

.exercise-card-img img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.exercise-card:hover .exercise-card-img img {
    transform: scale(1.05);
}

.card-overlay {
    position: absolute;
    bottom: 6px; right: 6px;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    border-radius: 6px;
    padding: 2px 7px;
}

.card-duration {
    font-size: 11px;
    font-weight: 600;
    color: var(--primary);
}

.exercise-card-body {
    padding: 10px 12px;
}

.exercise-tag {
    display: inline-block;
    background: rgba(110,231,247,0.15);
    color: var(--primary);
    border-radius: 4px;
    font-size: 10px;
    font-weight: 600;
    padding: 2px 7px;
    letter-spacing: 0.3px;
    margin-bottom: 5px;
}

.exercise-tag.shoulder {
    background: rgba(129,140,248,0.15);
    color: var(--accent);
}

.exercise-tag.back {
    background: rgba(249,115,22,0.15);
    color: var(--warning);
}

.exercise-tag.scm {
    background: rgba(52,211,153,0.15);
    color: var(--success);
}

.exercise-card-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 3px;
    line-height: 1.3;
}

.exercise-card-tip {
    font-size: 11px;
    color: var(--text-muted);
    line-height: 1.4;
}

/* ============================================
   Stats Row
   ============================================ */
.stats-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 14px 10px;
    text-align: center;
    transition: all var(--transition-base);
}

.stat-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-strong);
    transform: translateY(-2px);
}

.stat-icon { font-size: 20px; margin-bottom: 6px; }

.stat-value {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 3px;
    font-variant-numeric: tabular-nums;
}

.stat-label {
    font-size: 10px;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ============================================
   Lightbox
   ============================================ */
.lightbox-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.lightbox-overlay.visible {
    opacity: 1;
    pointer-events: all;
}

.lightbox-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    max-width: 90vw;
    max-height: 90vh;
    transform: scale(0.9);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.lightbox-overlay.visible .lightbox-content {
    transform: scale(1);
}

.lightbox-content img {
    max-width: min(720px, 88vw);
    max-height: 75vh;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: var(--radius-lg);
    box-shadow: 0 30px 80px rgba(0,0,0,0.7);
    background: #fff;
    display: block;
}

.lightbox-caption {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    text-align: center;
}

.lightbox-caption strong {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-primary);
}

.lightbox-caption span {
    font-size: 13px;
    color: var(--text-secondary);
}

/* Close button */
.lightbox-close {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 50%;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    z-index: 201;
}

.lightbox-close svg { width: 20px; height: 20px; }

.lightbox-close:hover {
    background: rgba(255,255,255,0.2);
    transform: rotate(90deg);
}

/* Prev / Next nav */
.lightbox-nav {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 50%;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    z-index: 201;
}

.lightbox-nav svg { width: 22px; height: 22px; }

.lightbox-nav:hover {
    background: rgba(255,255,255,0.22);
    transform: translateY(-50%) scale(1.08);
}

.lightbox-prev { left: 16px; }
.lightbox-next { right: 16px; }

/* Make exercise card images show pointer cursor */
.exercise-card-img {
    cursor: zoom-in;
}

/* ============================================
   Alert Modal
   ============================================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

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

.modal {
    background: rgba(15,23,42,0.95);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-xl);
    padding: 32px 24px;
    max-width: 360px;
    width: 100%;
    text-align: center;
    position: relative;
    overflow: hidden;
    transform: translateY(20px) scale(0.96);
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-lg), 0 0 60px rgba(249,115,22,0.15);
}

.modal-overlay.visible .modal {
    transform: translateY(0) scale(1);
}

.modal-decoration {
    position: absolute;
    top: -60px; left: 50%;
    transform: translateX(-50%);
    width: 200px; height: 200px;
    background: radial-gradient(circle, rgba(249,115,22,0.2) 0%, transparent 70%);
    pointer-events: none;
}

.modal-icon {
    font-size: 48px;
    margin-bottom: 12px;
    display: block;
    animation: modalIconBounce 1s ease infinite alternate;
}

@keyframes modalIconBounce {
    from { transform: translateY(0); }
    to   { transform: translateY(-6px); }
}

.modal-title {
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--warning), var(--danger));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}

.modal-body {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
}

.modal-exercise-preview {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 12px;
    margin-bottom: 18px;
    text-align: left;
}

.modal-exercise-preview img {
    width: 60px; height: 60px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.modal-exercise-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.modal-exercise-info strong {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-exercise-info span {
    font-size: 12px;
    color: var(--text-muted);
}

.modal-exercise-detail {
    font-size: 11px;
    color: var(--text-muted);
    line-height: 1.5;
    margin-top: 2px;
    font-style: italic;
}

.modal-countdown {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 12px;
}

.modal-countdown span {
    font-size: 32px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.modal-progress-bar {
    width: 100%;
    height: 6px;
    background: rgba(255,255,255,0.08);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 20px;
}

.modal-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 3px;
    width: 100%;
    transition: width 1s linear;
}

.btn-modal {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-dark), var(--accent-dark));
    color: #fff;
    border: none;
    padding: 14px 24px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    font-family: 'Outfit', sans-serif;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 4px 20px rgba(110,231,247,0.2);
}

.btn-modal:hover {
    opacity: 0.9;
    transform: translateY(-1px);
    box-shadow: 0 6px 24px rgba(110,231,247,0.3);
}

.btn-modal:active { transform: scale(0.98); }

/* ============================================
   Settings Panel
   ============================================ */
.settings-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 90;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: 0 0 0 0;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.settings-overlay.visible {
    opacity: 1;
    pointer-events: all;
}

.settings-panel {
    background: rgba(15,23,42,0.98);
    border: 1px solid var(--border-strong);
    border-bottom: none;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    padding: 24px;
    width: 100%;
    max-width: 480px;
    transform: translateY(100%);
    transition: transform var(--transition-slow);
}

.settings-overlay.visible .settings-panel {
    transform: translateY(0);
}

.settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.settings-header h3 {
    font-size: 18px;
    font-weight: 700;
}

.settings-body { display: flex; flex-direction: column; gap: 20px; margin-bottom: 24px; }

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

.setting-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.setting-select {
    background: var(--bg-card);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    padding: 8px 12px;
    font-size: 14px;
    font-family: 'Outfit', sans-serif;
    font-weight: 500;
    cursor: pointer;
    outline: none;
    transition: border-color var(--transition-fast);
}

.setting-select:focus { border-color: var(--primary); }
.setting-select option { background: #0f172a; }

/* Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 48px; height: 26px;
    cursor: pointer;
}

.toggle-switch input { display: none; }

.toggle-slider {
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,0.1);
    border-radius: 13px;
    transition: background var(--transition-base);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 20px; height: 20px;
    border-radius: 50%;
    background: var(--text-secondary);
    top: 3px; left: 3px;
    transition: all var(--transition-base);
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.toggle-switch input:checked + .toggle-slider {
    background: linear-gradient(135deg, var(--primary-dark), var(--accent-dark));
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(22px);
    background: #fff;
}

.btn-save-settings {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-dark), var(--accent-dark));
    color: #fff;
    border: none;
    padding: 14px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    font-family: 'Outfit', sans-serif;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 4px 20px rgba(110,231,247,0.2);
}

.btn-save-settings:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

/* ============================================
   Animations & Utilities
   ============================================ */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

.app-header   { animation: fadeInUp 0.5s ease both; }
.timer-card   { animation: fadeInUp 0.5s 0.1s ease both; }
.exercises-section { animation: fadeInUp 0.5s 0.2s ease both; }
.stats-row    { animation: fadeInUp 0.5s 0.3s ease both; }

/* Ripple effect on btn-main */
.btn-main:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Responsive */
@media (max-width: 360px) {
    .timer-display { font-size: 34px; }
    .circular-timer-container { width: 170px; height: 170px; }
    .stat-card { padding: 12px 8px; }
    .stat-value { font-size: 14px; }
}