:root,
html[data-theme="light"],
body[data-theme="light"],
.theme-light {
    --primary: #1f5f4a;
    --primary-dark: #164535;
    --primary-light: #e7f2ed;
    --accent: #d8a72c;
    --text-title: #164535;
    --text: #1d2b25;
    --muted: #65736d;
    --card-bg: rgba(255, 255, 255, 0.98);
    --card-border: rgba(255, 255, 255, 0.4);
    --card-shadow: 0 18px 55px rgba(0, 0, 0, 0.28);
    --input-bg: #ffffff;
    --input-text: #1d2b25;
    --border: #d7e2dc;
    --error-bg: #fff0f0;
    --error-text: #a32929;
    --error-border: #d34a4a;
    --success-bg: #ecfff3;
    --success-text: #1c653c;
    --success-border: #2d8a57;
    --btn-toggle-bg: #ffffff;
    --btn-toggle-color: #1f5f4a;
    --bg-overlay: rgba(235, 244, 239, 0.88);
}

:root[data-theme="dark"],
html[data-theme="dark"],
body[data-theme="dark"],
.theme-dark {
    --primary: #34d399;
    --primary-dark: #10b981;
    --primary-light: #142e22;
    --accent: #fbbf24;
    --text-title: #ffffff;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --card-bg: rgba(16, 26, 20, 0.96);
    --card-border: rgba(52, 211, 153, 0.2);
    --card-shadow: 0 20px 60px rgba(0, 0, 0, 0.75);
    --input-bg: #0d1712;
    --input-text: #f8fafc;
    --border: #23372c;
    --error-bg: #2d1212;
    --error-text: #f87171;
    --error-border: #ef4444;
    --success-bg: #0f2d1e;
    --success-text: #4ade80;
    --success-border: #22c55e;
    --btn-toggle-bg: #15241b;
    --btn-toggle-color: #fbbf24;
    --bg-overlay: rgba(5, 12, 8, 0.94);
}

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

body {
    min-height: 100vh;
    font-family: "Poppins", sans-serif;
    color: var(--text);
    background:
        linear-gradient(var(--bg-overlay), var(--bg-overlay)),
        url("https://images.unsplash.com/photo-1521587760476-6c12a4b040da?auto=format&fit=crop&w=1600&q=80") center / cover no-repeat;
    transition: background 0.3s ease, color 0.3s ease;
}

.auth-page {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 32px 16px;
}

.auth-card {
    width: min(100%, 480px);
    padding: 36px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 22px;
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(10px);
    transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 24px;
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    transition: color 0.2s ease;
}

.back-link:hover {
    text-decoration: underline;
}

.auth-icon {
    width: 62px;
    height: 62px;
    display: grid;
    place-items: center;
    margin-bottom: 16px;
    color: #ffffff;
    font-size: 24px;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    border-radius: 16px;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.2);
}

.auth-card h1 {
    margin-bottom: 8px;
    color: var(--text-title);
    font-size: 28px;
    transition: color 0.3s ease;
}

.auth-description {
    margin-bottom: 24px;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.7;
    transition: color 0.3s ease;
}

/* ==========================================================================
   ROLE SEGMENTED SELECTOR (PELAJAR / PENGAJAR)
   ========================================================================== */
.role-switcher-group {
    margin-bottom: 20px;
}

.role-switcher-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
}

.role-switcher {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    padding: 6px;
    background: var(--input-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
}

.role-tab-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 14px;
    border: 0;
    border-radius: 8px;
    font: inherit;
    font-size: 13px;
    font-weight: 600;
    color: var(--muted);
    background: transparent;
    cursor: pointer;
    transition: all 0.25s ease;
}

.role-tab-btn:hover {
    color: var(--primary);
    background: var(--primary-light);
}

.role-tab-btn.active {
    color: #ffffff;
    background: var(--primary);
    box-shadow: 0 4px 12px rgba(31, 95, 74, 0.25);
}

.role-tab-btn i {
    font-size: 15px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 7px;
    margin-bottom: 16px;
}

.form-group label {
    color: var(--text);
    font-size: 13px;
    font-weight: 600;
    transition: color 0.3s ease;
}

.form-group input {
    width: 100%;
    padding: 13px 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    outline: none;
    font: inherit;
    font-size: 14px;
    color: var(--input-text);
    background: var(--input-bg);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.3s ease, color 0.3s ease;
}

.form-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.25);
}

.submit-button {
    width: 100%;
    margin-top: 8px;
    padding: 14px;
    border: 0;
    border-radius: 10px;
    color: #ffffff;
    font: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    background: linear-gradient(135deg, #1f5f4a, #2a8366);
    box-shadow: 0 6px 16px rgba(31, 95, 74, 0.25);
    transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.submit-button:hover {
    background: linear-gradient(135deg, #164535, #1f5f4a);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(31, 95, 74, 0.35);
}

[data-theme="dark"] .submit-button {
    background: linear-gradient(135deg, #059669, #10b981);
    box-shadow: 0 6px 16px rgba(16, 185, 129, 0.3);
}

[data-theme="dark"] .submit-button:hover {
    background: linear-gradient(135deg, #047857, #059669);
    box-shadow: 0 8px 20px rgba(16, 185, 129, 0.4);
}

.switch-auth {
    margin-top: 22px;
    color: var(--muted);
    font-size: 13px;
    text-align: center;
}

.switch-auth a {
    color: var(--primary);
    font-weight: 600;
    text-decoration: none;
}

.switch-auth a:hover {
    text-decoration: underline;
}

.alert-error {
    margin-bottom: 18px;
    padding: 12px 14px;
    border-left: 4px solid var(--error-border);
    border-radius: 8px;
    color: var(--error-text);
    font-size: 13px;
    background: var(--error-bg);
}

.alert-success {
    margin-bottom: 18px;
    padding: 12px 14px;
    border-left: 4px solid var(--success-border);
    border-radius: 8px;
    color: var(--success-text);
    font-size: 13px;
    background: var(--success-bg);
}

.theme-toggle-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--btn-toggle-bg);
    color: var(--btn-toggle-color);
    display: grid;
    place-items: center;
    cursor: pointer;
    font-size: 17px;
    transition: background 0.3s ease, color 0.3s ease, transform 0.25s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
}

.theme-toggle-btn:hover {
    transform: rotate(18deg) scale(1.08);
    border-color: var(--primary);
}

.floating-theme-toggle {
    position: fixed;
    top: 22px;
    right: 22px;
    z-index: 9999;
}

@media (max-width: 480px) {
    .auth-card {
        padding: 28px 20px;
    }
}