:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --accent-color: #ff4500;
    --accent-hover: #ff6a33;
    --secondary-color: #2c2c2c;
    --success-color: #4caf50;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex; flex-direction: column; min-height: 100vh; align-items: center;
}

header {
    width: 100%; background-color: var(--card-bg); padding: 1.5rem; text-align: center;
    border-bottom: 3px solid var(--accent-color); margin-bottom: 2rem;
}
header h1 { color: var(--accent-color); letter-spacing: 2px; }

main { width: 90%; max-width: 600px; text-align: center; }

.page { display: none; animation: fadeIn 0.3s ease-in-out; }
.page.active { display: block; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

h2 { margin-bottom: 1.5rem; color: #ffffff; }

.button-group { display: flex; flex-direction: column; gap: 1rem; margin-top: 1rem; }

button { cursor: pointer; border: none; border-radius: 8px; font-size: 1.1rem; font-weight: bold; transition: all 0.2s ease; }

.btn-primary { background-color: var(--accent-color); color: white; padding: 1.2rem; text-transform: uppercase; letter-spacing: 1px; }
.btn-primary:hover { background-color: var(--accent-hover); transform: scale(1.02); }

.btn-back { background-color: transparent; color: var(--text-color); border: 1px solid var(--secondary-color); padding: 0.5rem 1rem; margin-bottom: 1rem; font-size: 0.9rem; }
.btn-back:hover { background-color: var(--secondary-color); }

.form-group { background-color: var(--card-bg); padding: 1.5rem; border-radius: 10px; margin-bottom: 1.5rem; text-align: left; }
.form-group label { display: block; margin-bottom: 0.5rem; font-weight: bold; color: var(--accent-color); }

select, input[type="number"] { width: 100%; padding: 0.8rem; border-radius: 5px; border: 1px solid var(--secondary-color); background-color: var(--bg-color); color: var(--text-color); font-size: 1rem; }

.toggle-group, .time-buttons, .round-buttons { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.5rem; }
.btn-toggle, .btn-time, .btn-round { flex: 1; min-width: 80px; padding: 0.8rem; background-color: var(--secondary-color); color: var(--text-color); font-size: 0.9rem; }
.btn-toggle.active, .btn-time.active, .btn-round.active { background-color: var(--accent-color); color: white; }

.btn-small { background-color: var(--secondary-color); color: var(--text-color); padding: 0.4rem 0.8rem; font-size: 0.8rem; margin-top: 0.5rem; }
.info-box { background-color: #2a1a1a; border-left: 4px solid var(--accent-color); padding: 1rem; margin-bottom: 1.5rem; border-radius: 4px; text-align: left; }

.btn-start { width: 100%; background-color: var(--success-color); color: white; padding: 1.2rem; font-size: 1.2rem; text-transform: uppercase; }
.btn-start:hover { background-color: #43a047; }

.btn-stop { background-color: #d32f2f; color: white; padding: 1rem 2rem; }
.btn-stop:hover { background-color: #b71c1c; }

/* ACTIVE SESSION TIMER STYLES */
.timer-display {
    background-color: var(--card-bg); padding: 2rem; border-radius: 15px; margin-bottom: 1.5rem;
    display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
}

.round-indicator { font-size: 1.2rem; font-weight: bold; color: var(--accent-color); text-transform: uppercase; letter-spacing: 1px; }

/* NEW: Huge Move Name */
.move-name {
    font-size: 3rem;
    font-weight: 900;
    color: #ffffff;
    text-transform: uppercase;
    line-height: 1.1;
    margin: 0.5rem 0;
    text-align: center;
}

.clock {
    font-size: 8rem;
    font-weight: 900;
    font-variant-numeric: tabular-nums;
    color: #ffffff; /* Pure white for the workout */
    margin: 0.5rem 0;
    line-height: 1;
}

.phase-indicator { font-size: 1.5rem; font-weight: bold; color: var(--success-color); text-transform: uppercase; }
.phase-indicator.rest { color: #2196f3; }

/* NEW: Up Next */
.up-next { font-size: 1.2rem; color: #888; margin-top: 1rem; font-style: italic; }

/* DISCREET TOP BAR & RESTART BUTTON */
.active-top-bar {
    width: 100%;
    display: flex;
    justify-content: flex-start;
    margin-bottom: 1rem;
    padding-left: 0.5rem;
}

.btn-discreet {
    background: transparent;
    color: var(--text-color);
    border: 1px solid var(--secondary-color);
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
    border-radius: 20px; /* Pill shape looks discreet */
    opacity: 0.7;
    transition: all 0.2s ease;
}

.btn-discreet:hover, .btn-discreet:active {
    background: var(--secondary-color);
    opacity: 1;
    color: white;
}

/* ==========================================
   PHASE 1: VISIBILITY & CONTRAST UPGRADES
   ========================================== */

/* 1. Massive, Pure White Countdown Timer */
.clock.countdown-mode {
    font-size: 8rem !important;
    color: #ffffff !important;
    font-weight: 900 !important;
    text-shadow: 0 4px 10px rgba(0,0,0,0.5);
    line-height: 1 !important;
}

/* 2. High-Contrast REST Mode (Light Background, Dark Text) */
.timer-display.rest-mode {
    background-color: #f4f4f5 !important; /* Light gray/white */
    border: 2px solid #121212;
}

.timer-display.rest-mode .clock,
.timer-display.rest-mode .move-name,
.timer-display.rest-mode .round-indicator {
    color: #121212 !important; /* Pure black for max daylight contrast */
}

.timer-display.rest-mode .phase-indicator {
    color: #d32f2f !important; /* Bold red for REST */
    font-weight: 900;
}

.timer-display.rest-mode .up-next {
    color: #555555 !important;
}