/* =========================================
   1. Reset & Base Styles
   ========================================= */
body {
    font-family: 'Segoe UI', 'Microsoft JhengHei', sans-serif;
    background: var(--primary-gradient);
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
}

.countdown-page {
    width: 100%;
    max-width: 520px;
}

/* =========================================
   2. Card & Display
   ========================================= */
.countdown-card {
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px 32px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    text-align: center;
}

.countdown-card h1 {
    margin-bottom: 28px;
    font-size: 2.4rem;
    font-weight: 400;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.display {
    font-size: 4rem;
    font-weight: 700;
    margin: 30px 0;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
    font-family: 'Courier New', monospace;
    letter-spacing: 3px;
}

.display.finished {
    animation: pulse 1s infinite;
    color: #ff4757;
}

/* =========================================
   3. Inputs
   ========================================= */
.time-input {
    display: flex;
    justify-content: center;
    gap: 18px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.input-group {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.input-group label {
    font-size: 0.95rem;
    margin-bottom: 6px;
    opacity: 0.9;
}

.input-group input {
    width: 84px;
    height: 56px;
    font-size: 1.6rem;
    text-align: center;
    border: 2px solid rgba(255, 255, 255, 0.35);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    outline: none;
    transition: var(--transition-normal);
}

.input-group input:focus {
    border-color: rgba(255, 255, 255, 0.85);
    background: rgba(255, 255, 255, 0.3);
}

.input-group input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

/* =========================================
   4. Controls
   ========================================= */
.controls {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 30px;
    flex-wrap: wrap;
}

button {
    padding: 12px 28px;
    font-size: 1.1rem;
    border: none;
    border-radius: 28px;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    font-weight: 600;
    min-width: 120px;
}

.start-btn {
    background: linear-gradient(45deg, #4caf50, #45a049);
    color: #fff;
}

.start-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(76, 175, 80, 0.4);
}

.pause-btn {
    background: linear-gradient(45deg, #ff9800, #f57c00);
    color: #fff;
}

.pause-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(255, 152, 0, 0.4);
}

.stop-btn {
    background: linear-gradient(45deg, #f44336, #d32f2f);
    color: #fff;
}

.stop-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(244, 67, 54, 0.4);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

/* =========================================
   5. Media Queries
   ========================================= */
@media (max-width: 480px) {
    body {
        align-items: flex-start;
    }

    .countdown-card {
        padding: 32px 20px;
    }

    .display {
        font-size: 2.6rem;
    }

    .time-input {
        gap: 12px;
    }
}