:root {
    --primary-color: #0d6efd;
    --primary-dark: #0056b3;
    --secondary-color: #0dcaf0;
    --accent-gradient: linear-gradient(120deg, #0056b3, #00a8cc);

    --bg-body: #f3f4f6;
    --bg-card: #ffffff;
    --bg-soft: #f8f9fa;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --border-color: rgba(0,0,0,0.08);
    --shadow-color: rgba(0,0,0,0.05);
    --shadow-lg: rgba(0,0,0,0.1);
    --hover-bg: #f0f4ff;
    --input-bg: #f8f9fa;
    --input-border: rgba(0,0,0,0.1);
    --input-focus-shadow: rgba(13,110,253,0.12);

    --transition-speed: 0.3s;
}

[data-theme="dark"] {
    --bg-body: #0f1117;
    --bg-card: #1a1d27;
    --bg-soft: #242836;
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    --border-color: rgba(255,255,255,0.06);
    --shadow-color: rgba(0,0,0,0.4);
    --shadow-lg: rgba(0,0,0,0.6);
    --hover-bg: rgba(13,110,253,0.08);
    --input-bg: #242836;
    --input-border: rgba(255,255,255,0.08);
    --input-focus-shadow: rgba(13,110,253,0.2);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    position: relative;
    overflow: hidden;
}

a { text-decoration: none; color: inherit; }

/* ===== BACKGROUND PATTERN ===== */
.bg-pattern {
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
}

.bg-blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.12;
    animation: blobFloat 12s ease-in-out infinite;
}

.bg-blob-1 {
    width: 500px; height: 500px;
    background: #0d6efd;
    top: -150px; left: -100px;
    animation-delay: 0s;
}

.bg-blob-2 {
    width: 400px; height: 400px;
    background: #0dcaf0;
    bottom: -100px; right: -80px;
    animation-delay: 3s;
}

.bg-blob-3 {
    width: 300px; height: 300px;
    background: #6366f1;
    top: 40%; right: 10%;
    animation-delay: 6s;
}

[data-theme="dark"] .bg-blob { opacity: 0.06; }

[data-theme="dark"] .form-control,
[data-theme="dark"] .form-input {
    color: var(--text-main) !important;
    caret-color: var(--text-main);
}

@keyframes blobFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(20px, -20px) scale(1.05); }
    66% { transform: translate(-15px, 15px) scale(0.95); }
}

/* ===== LOADER ===== */
#loader {
    position: fixed; inset: 0;
    background: var(--bg-body);
    z-index: 99999;
    display: flex; flex-direction: column;
    justify-content: center; align-items: center;
    transition: opacity 0.5s ease-out, visibility 0.5s;
}
.loader-hidden { opacity: 0; visibility: hidden; pointer-events: none; }

/* ===== THEME TOGGLE ===== */
.theme-toggle {
    position: fixed;
    top: 20px; right: 20px;
    width: 42px; height: 42px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    color: var(--text-main);
    font-size: 1.05rem;
    transition: all 0.2s;
    z-index: 100;
    box-shadow: 0 2px 12px var(--shadow-color);
}

.theme-toggle:hover {
    background: var(--hover-bg);
    color: var(--primary-color);
    transform: rotate(20deg);
}

/* ===== LOGIN CARD ===== */
.login-card {
    width: 100%;
    max-width: 420px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 30px 20px;
    box-shadow: 0 4px 24px var(--shadow-color), 0 12px 48px var(--shadow-color);
    position: relative;
    z-index: 1;
    transition: background var(--transition-speed), border-color var(--transition-speed), box-shadow var(--transition-speed);
}

/* ===== BRAND HEADER ===== */
.login-brand {
    text-align: center;
    margin-bottom: 32px;
}

.brand-logo-box {
    width: 64px; height: 64px;
    background: var(--primary-color);
    border-radius: 18px;
    display: inline-flex;
    align-items: center; justify-content: center;
    font-size: 1.8rem;
    color: white;
    margin-bottom: 18px;
    box-shadow: 0 6px 20px rgba(0,86,179,0.25);
    position: relative;
}

.brand-logo-box::after {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 20px;
    background: var(--accent-gradient);
    z-index: -1;
    opacity: 0.15;
    filter: blur(8px);
}

.login-brand h4 {
    font-weight: 800;
    font-size: 1.25rem;
    margin-bottom: 2px;
}

.login-brand .brand-sub {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 500;
}

.login-title {
    text-align: center;
    margin-bottom: 28px;
}

.login-title h5 {
    font-weight: 700;
    font-size: 1.08rem;
    margin-bottom: 4px;
}

.login-title p {
    font-size: 0.82rem;
    color: var(--text-muted);
}

/* ===== ALERT ===== */
.alert-box {
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
    display: none;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    animation: fadeSlide 0.3s ease;
}

.alert-box.show { display: flex; }

.alert-box i { font-size: 1rem; flex-shrink: 0; }

.alert-error {
    background: #fee2e2;
    color: #dc2626;
    border: 1px solid rgba(220,38,38,0.12);
}

.alert-success {
    background: #dcfce7;
    color: #16a34a;
    border: 1px solid rgba(22,163,74,0.12);
}

[data-theme="dark"] .alert-error {
    background: rgba(239,68,68,0.1);
    color: #f87171;
    border-color: rgba(239,68,68,0.15);
}

[data-theme="dark"] .alert-success {
    background: rgba(34,197,94,0.1);
    color: #4ade80;
    border-color: rgba(34,197,94,0.15);
}

@keyframes fadeSlide {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: translateY(0); }
}

.input-group-custom .invalid-feedback {
    display: block;
}

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

.form-label-custom {
    display: block;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 7px;
}

.input-wrap {
    display: flex;
    flex-direction: column;
    position: relative;
}

.input-wrap .form-control {
    height: 44px;
}

.icon-left {
    position: absolute;
    left: 14px;
    top: 22px;
    transform: translateY(-50%);
}

.form-input {
    width: 100%;
    padding: 12px 14px 12px 42px;
    background: var(--input-bg);
    border: 1.5px solid var(--input-border);
    border-radius: 12px;
    font-size: 0.86rem;
    font-family: 'Inter', sans-serif;
    color: var(--text-main);
    transition: all 0.2s ease;
    outline: none;
}

.form-input::placeholder {
    color: var(--text-muted);
    font-weight: 400;
}

.form-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--input-focus-shadow);
    background: var(--bg-card);
}

.input-wrap:focus-within .icon-left {
    color: var(--primary-color);
}

.form-input.has-right {
    padding-right: 46px;
}

.form-input.is-error {
    border-color: #ef4444;
}

.form-input.is-error:focus {
    box-shadow: 0 0 0 3px rgba(239,68,68,0.1);
}

/* Password toggle */
.pass-toggle {
    position: absolute;
    right: 14px; top: 50%;
    transform: translateY(-50%);
    background: none; border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    padding: 0;
    transition: color 0.2s;
    z-index: 2;
}

.pass-toggle:hover { color: var(--primary-color); }

/* Field error */
.field-error {
    font-size: 0.7rem;
    color: #ef4444;
    margin-top: 5px;
    display: none;
    align-items: center;
    gap: 4px;
}

.field-error.show { display: flex; }
.field-error i { font-size: 0.65rem; }

[data-theme="dark"] .field-error { color: #f87171; }

/* ===== OPTIONS ROW ===== */
.options-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 26px;
}

.check-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    user-select: none;
}

.check-wrap input { display: none; }

.check-box {
    width: 18px; height: 18px;
    border: 1.5px solid var(--input-border);
    border-radius: 5px;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.2s;
    background: var(--input-bg);
    flex-shrink: 0;
}

.check-box i {
    font-size: 0.65rem;
    color: white;
    opacity: 0;
    transition: opacity 0.15s;
}

.check-wrap input:checked + .check-box {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.check-wrap input:checked + .check-box i { opacity: 1; }

.check-label {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 500;
}

.forgot-link {
    font-size: 0.78rem;
    color: var(--primary-color);
    font-weight: 600;
}

.forgot-link:hover { opacity: 0.8; color: var(--primary-color); }

/* ===== SUBMIT BUTTON ===== */
.btn-login {
    width: 100%;
    padding: 13px;
    background: var(--primary-dark);
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 0.9rem;
    font-weight: 700;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    position: relative;
    overflow: hidden;
}

.btn-login::before {
    content: '';
    position: absolute;
    top: 0; left: -100%;
    width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.12), transparent);
    transition: left 0.5s ease;
}

.btn-login:hover::before { left: 100%; }

.btn-login:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(0,86,179,0.3);
}

.btn-login:active { transform: translateY(0); }

.btn-login.loading { pointer-events: none; opacity: 0.85; }

.btn-login .spinner {
    display: none;
    width: 18px; height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.btn-login.loading .spinner { display: block; }
.btn-login.loading .btn-label { display: none; }

@keyframes spin { to { transform: rotate(360deg); } }

/* ===== DIVIDER ===== */
.form-divider {
    display: flex;
    align-items: center;
    gap: 14px;
    margin: 24px 0;
}

.form-divider::before,
.form-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

.form-divider span {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* ===== SOCIAL ===== */
.social-row {
    display: flex;
    gap: 10px;
}

.btn-social {
    flex: 1;
    padding: 11px;
    border: 1.5px solid var(--input-border);
    border-radius: 12px;
    background: var(--input-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
}

.btn-social i { font-size: 1.05rem; }

.btn-social:hover {
    border-color: var(--primary-color);
    background: var(--hover-bg);
    color: var(--primary-color);
}

/* ===== FOOTER ===== */
.card-footer-text {
    text-align: center;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.card-footer-text p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.card-footer-text a {
    color: var(--primary-color);
    font-weight: 700;
}

.card-footer-text a:hover { opacity: 0.8; }

.page-copyright {
    position: fixed;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.68rem;
    color: var(--text-muted);
    opacity: 0.6;
    z-index: 1;
    white-space: nowrap;
}

.page-copyright span { color: #ef4444; }

/* ===== SHAKE ===== */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-6px); }
    40% { transform: translateX(6px); }
    60% { transform: translateX(-4px); }
    80% { transform: translateX(4px); }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 480px) {
    body { padding: 16px; }

    .login-card {
        padding: 32px 24px;
        border-radius: 20px;
    }

    .brand-logo-box {
        width: 56px; height: 56px;
        font-size: 1.5rem;
        border-radius: 16px;
    }

    .social-row { flex-direction: column; }

    .options-row {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }

    .page-copyright { display: none; }
}

@media (max-height: 700px) {
    .login-brand { margin-bottom: 24px; }
    .login-title { margin-bottom: 22px; }
    .form-group { margin-bottom: 16px; }
    .options-row { margin-bottom: 20px; }
    .form-divider { margin: 18px 0; }
    .login-card { padding: 30px 28px; }
}