:root {
    color-scheme: light;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --bg: #f7fbfa;
    --card: #ffffff;
    --text: #0f1c2e;
    --muted: #6c7a8c;
    --primary: #0b8c7a;
    --accent: #ff8a65;
    --radius: 20px;
}

body.dark {
    --bg: #0c1419;
    --card: #101f29;
    --text: #f4fbff;
    --muted: #89a0b5;
    --primary: #4dd0e1;
    color-scheme: dark;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--bg);
    color: var(--text);
}

.hidden { display: none !important; }

.screen-warning {
    position: fixed;
    inset: 0;
    background: var(--bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    text-align: center;
    gap: 1rem;
    z-index: 10;
}

.auth-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 1.5rem;
}

.auth-card {
    width: min(100%, 420px);
    background: var(--card);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: 0 18px 40px rgba(15, 30, 45, 0.08);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.auth-card h1 { margin: 0; font-size: 2rem; }

.stacked {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

label {
    display: flex;
    flex-direction: column;
    font-size: 0.9rem;
    color: var(--muted);
    gap: 0.35rem;
}

input, select, button, textarea {
    border-radius: 14px;
    border: 1px solid rgba(15, 28, 46, 0.1);
    padding: 0.85rem 1rem;
    font: inherit;
}

button {
    background: var(--primary);
    color: #fff;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

button.ghost {
    background: rgba(11, 140, 122, 0.1);
    color: var(--primary);
}

button:active { transform: scale(0.98); }

.app-shell {
    min-height: 100vh;
    max-width: 500px;
    margin: 0 auto;
    padding-bottom: 80px;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.25rem 0.5rem;
}

.header-actions { display: flex; gap: 0.5rem; }

.muted { color: var(--muted); margin: 0; }

main { padding: 0 1.25rem 1.25rem; }

.view { display: none; animation: fade 0.3s ease; }
.view.active { display: block; }

@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

.card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow: 0 18px 30px rgba(15, 30, 45, 0.08);
    margin-bottom: 1rem;
}

.card.stretch { min-height: 120px; }

.grid-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 0.85rem;
    margin-bottom: 1rem;
}

.grid-cards .card {
    margin: 0;
    min-height: 140px;
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: min(100%, 500px);
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    background: var(--card);
    border-radius: 999px;
    margin: 0 auto 1rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.12);
    padding: 0.35rem;
    gap: 0.35rem;
}

.bottom-nav button {
    border-radius: 999px;
    font-size: 0.75rem;
    padding: 0.6rem 0.2rem;
    border: none;
    background: transparent;
    color: var(--muted);
}

.bottom-nav button.active {
    background: var(--primary);
    color: #fff;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 1rem 0;
}

.exercise-card {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.exercise-card img {
    width: 100%;
    max-height: 110px;
    object-fit: contain;
}

.exercise-animation {
    height: 6px;
    border-radius: 999px;
    background: rgba(11, 140, 122, 0.2);
    overflow: hidden;
}

.exercise-animation::after {
    content: "";
    display: block;
    height: 100%;
    width: 40%;
    background: var(--primary);
    animation: pulse 1.3s infinite;
}

@keyframes pulse {
    0% { transform: translateX(-100%); }
    50% { transform: translateX(60%); }
    100% { transform: translateX(160%); }
}

.timer {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin: 1rem 0;
}

.timer-controls {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

.progress-bar {
    width: 100%;
    height: 10px;
    border-radius: 999px;
    background: rgba(11, 140, 122, 0.15);
    overflow: hidden;
}

.progress-bar span {
    display: block;
    height: 100%;
    background: var(--primary);
}

.meal-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
}

.meal-card strong { font-size: 1.1rem; }

@media (min-width: 900px) {
    .screen-warning.hidden { display: none; }
    .screen-warning { display: flex; }
    .app-shell { filter: blur(5px); pointer-events: none; }
}