/* === ROOT VARIABLES (LIGHT MODE DEFAULT) === */
:root {
    --bg-color: #f4f7f9;
    --form-bg-color: #ffffff;
    --text-color: #212529;
    --label-color: #495057;
    --input-bg-color: #ffffff;
    --input-border-color: #ced4da;
    --input-focus-border: #005ae0;
    --input-focus-shadow: rgba(0, 90, 224, 0.1);
    --hint-color: #6c757d;
    --primary-color: #005ae0;
    --primary-hover-color: #004ab6;
    --shadow-color: rgba(0, 0, 0, 0.08);
    --switch-bg: #e9ecef;
    --switch-icon-color: #495057;
    --switch-thumb-bg: #fff;
}

/* === DARK MODE VARIABLES === */
body.dark-mode {
    --bg-color: #121212;
    --form-bg-color: #1e1e1e;
    --text-color: #e0e0e0;
    --label-color: #adb5bd;
    --input-bg-color: #2a2a2a;
    --input-border-color: #4d4d4d;
    --input-focus-border: #4dabf7;
    --input-focus-shadow: rgba(77, 171, 247, 0.15);
    --hint-color: #868e96;
    --primary-color: #4dabf7;
    --primary-hover-color: #74c0fc;
    --shadow-color: rgba(0, 0, 0, 0.25);
    --switch-bg: #343a40;
    --switch-icon-color: #f8f9fa;
    --switch-thumb-bg: #495057;
}

/* === GENERAL STYLES & TRANSITIONS === */
body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    box-sizing: border-box;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* === FORM CONTAINER === */
.form-container {
    background-color: var(--form-bg-color);
    padding: 30px 40px;
    border-radius: 12px;
    box-shadow: 0 8px 25px var(--shadow-color);
    width: 100%;
    max-width: 500px;
    transition: background-color 0.3s ease;
}

.form-header h2 {
    margin: 0 0 25px 0;
    font-weight: 600;
    color: var(--text-color);
    font-size: 24px;
    transition: color 0.3s ease;
    text-align: center;
}

/* === FORM ELEMENTS === */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: 500;
    color: var(--label-color);
    margin-bottom: 8px;
    font-size: 14px;
    transition: color 0.3s ease;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--input-border-color);
    background-color: var(--input-bg-color);
    color: var(--text-color);
    border-radius: 8px;
    font-size: 16px;
    font-family: 'Poppins', sans-serif;
    box-sizing: border-box;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--input-focus-border);
    box-shadow: 0 0 0 4px var(--input-focus-shadow);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.form-hint {
    font-size: 12px;
    color: var(--hint-color);
    margin-top: 5px;
    margin-bottom: 0;
}

/* Input[type=datetime-local] icon color */
input[type="datetime-local"]::-webkit-calendar-picker-indicator {
    filter: invert(var(--dark-mode-invert, 0));
}
body.dark-mode {
    --dark-mode-invert: 1;
}

/* === BUTTON === */
button[type="submit"] {
    width: 100%;
    padding: 14px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 10px;
}

button[type="submit"]:hover {
    background-color: var(--primary-hover-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 90, 224, 0.2);
}
body.dark-mode button[type="submit"]:hover {
    box-shadow: 0 4px 15px rgba(77, 171, 247, 0.2);
}

button[type="submit"]:disabled {
    background-color: #a9a9a9;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* === ANIMATED THEME SWITCH === */
.theme-switch-wrapper {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 100;
}
.theme-switch { display: inline-block; height: 34px; width: 60px; position: relative; }
.theme-switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: var(--switch-bg); border-radius: 34px; transition: 0.4s; }
.slider .icon-wrapper { position: absolute; content: ''; height: 26px; width: 26px; left: 4px; bottom: 4px; background-color: var(--switch-thumb-bg); border-radius: 50%; transition: 0.4s; display: flex; justify-content: center; align-items: center; }
.feather { color: var(--switch-icon-color); transition: opacity 0.3s ease, transform 0.4s ease; position: absolute; }
.moon { opacity: 0; transform: rotate(-90deg); }
.sun { opacity: 1; transform: rotate(0deg); }
input:checked + .slider .icon-wrapper { transform: translateX(26px); }
input:checked + .slider .sun { opacity: 0; transform: rotate(90deg); }
input:checked + .slider .moon { opacity: 1; transform: rotate(0deg); }

/* === COUNTDOWN DISPLAY === */
.hidden { display: none !important; }
#countdown-display { text-align: center; padding: 20px 0; }
#countdown-display h3 { margin: 0 0 10px 0; font-size: 22px; color: var(--text-color); }
#countdown-display p { margin: 0 0 20px 0; font-size: 16px; color: var(--label-color); }
#timer { font-size: 2.5em; font-weight: 600; color: var(--primary-color); letter-spacing: 2px; margin-bottom: 25px; }

/* === INDICATOR ANIMASI === */
.indicator-wrapper { width: 100%; height: 8px; background-color: var(--switch-bg); border-radius: 4px; overflow: hidden; }
.indicator { width: 100%; height: 100%; background: linear-gradient(90deg, var(--primary-color), var(--primary-hover-color)); border-radius: 4px; animation: pulse 2s infinite ease-in-out; }
@keyframes pulse { 0% { opacity: 1; } 50% { opacity: 0.6; } 100% { opacity: 1; } }

/* === RESPONSIVE DESIGN === */
@media (max-width: 576px) {
    body { padding: 15px; }
    .form-container { padding: 25px 20px; }
    .form-header h2 { font-size: 20px; }
    #timer { font-size: 1.8em; }
    #countdown-display h3 { font-size: 20px; }
}