/* SAI Online — modern login page */

:root {
    --login-primary: #042954;
    --login-primary-light: #0b4776;
    --login-accent: #3b82f6;
    --login-accent-soft: rgba(59, 130, 246, 0.15);
    --login-text: #0f172a;
    --login-muted: #64748b;
    --login-border: #e2e8f0;
    --login-card: rgba(255, 255, 255, 0.92);
    --login-radius: 16px;
    --login-font: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html,
body.login-body {
    margin: 0;
    min-height: 100%;
    font-family: var(--login-font);
    color: var(--login-text);
    -webkit-font-smoothing: antialiased;
}

body.login-body #preloader {
    display: none !important;
}

.login-scene {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: stretch;
    overflow: hidden;
    background: linear-gradient(135deg, #031a33 0%, var(--login-primary) 40%, #0a3d6b 100%);
}

/* Animated background orbs */
.login-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
}

.login-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.45;
    animation: login-orb-float 18s ease-in-out infinite;
}

.login-orb--1 {
    width: 420px;
    height: 420px;
    background: #3b82f6;
    top: -12%;
    left: -8%;
    animation-delay: 0s;
}

.login-orb--2 {
    width: 320px;
    height: 320px;
    background: #06b6d4;
    bottom: 10%;
    left: 28%;
    animation-delay: -6s;
}

.login-orb--3 {
    width: 280px;
    height: 280px;
    background: #6366f1;
    top: 35%;
    right: -5%;
    animation-delay: -12s;
}

.login-grid-lines {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse 80% 70% at 30% 50%, black 20%, transparent 75%);
}

@keyframes login-orb-float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(24px, -20px) scale(1.05);
    }
    66% {
        transform: translate(-16px, 16px) scale(0.95);
    }
}

/* Brand panel — illustration only */
.login-brand {
    position: relative;
    z-index: 1;
    flex: 1 1 48%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 2.5rem;
    overflow: hidden;
}

.login-visual {
    position: relative;
    width: 100%;
    max-width: 520px;
    aspect-ratio: 520 / 420;
    animation: login-fade-up 0.9s ease-out both;
}

.login-hero-img {
    display: block;
    width: 100%;
    height: auto;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.25));
    animation: login-hero-in 1s cubic-bezier(0.22, 1, 0.36, 1) 0.1s both;
}

@keyframes login-hero-in {
    from {
        opacity: 0;
        transform: scale(0.92) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.login-float-img {
    position: absolute;
    border-radius: 50%;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
    animation: login-float-bob 5s ease-in-out infinite;
}

.login-float-img--1 {
    top: 8%;
    left: -4%;
    width: clamp(72px, 18vw, 120px);
    height: auto;
    animation-delay: 0s;
}

.login-float-img--2 {
    top: 4%;
    right: -2%;
    width: clamp(68px, 16vw, 110px);
    height: auto;
    animation-delay: -1.6s;
}

.login-float-img--3 {
    bottom: 6%;
    right: 8%;
    width: clamp(60px, 14vw, 96px);
    height: auto;
    animation-delay: -3.2s;
}

@keyframes login-float-bob {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-12px) rotate(2deg);
    }
}

/* Form panel */
.login-panel {
    position: relative;
    z-index: 1;
    flex: 1 1 52%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: rgba(248, 250, 252, 0.04);
    backdrop-filter: blur(2px);
}

.login-card {
    width: 100%;
    max-width: 420px;
    padding: 2.5rem 2.25rem;
    background: var(--login-card);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: var(--login-radius);
    box-shadow:
        0 4px 6px -1px rgba(0, 0, 0, 0.06),
        0 24px 48px -12px rgba(4, 41, 84, 0.25);
    backdrop-filter: blur(20px);
    animation: login-card-in 0.9s cubic-bezier(0.22, 1, 0.36, 1) 0.1s both;
}

@keyframes login-card-in {
    from {
        opacity: 0;
        transform: translateY(24px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes login-fade-up {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-card-header {
    text-align: center;
    margin-bottom: 1.75rem;
}

.login-card-logo {
    display: block;
    width: 88px;
    height: 88px;
    margin: 0 auto 1rem;
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(4, 41, 84, 0.18);
    animation: login-logo-glow 3s ease-in-out infinite;
}

@keyframes login-logo-glow {
    0%, 100% {
        box-shadow: 0 8px 24px rgba(4, 41, 84, 0.18);
        transform: scale(1);
    }
    50% {
        box-shadow: 0 10px 32px rgba(4, 41, 84, 0.28);
        transform: scale(1.02);
    }
}

.login-card-header h1 {
    margin: 0 0 0.35rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--login-text);
}

.login-card-header p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--login-muted);
}

/* Alerts */
.login-alert {
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
    padding: 0.75rem 1rem;
    margin-bottom: 1.25rem;
    font-size: 0.875rem;
    border-radius: 10px;
    animation: login-shake-in 0.5s ease-out;
}

@keyframes login-shake-in {
    0% { opacity: 0; transform: translateX(-8px); }
    60% { transform: translateX(4px); }
    100% { opacity: 1; transform: translateX(0); }
}

.login-alert--error {
    color: #991b1b;
    background: #fef2f2;
    border: 1px solid #fecaca;
}

.login-alert--success {
    color: #166534;
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
}

.login-alert i {
    margin-top: 0.1rem;
    flex-shrink: 0;
}

/* Form fields */
.login-form .login-field {
    margin-bottom: 1.25rem;
    animation: login-fade-up 0.6s ease-out both;
}

.login-form .login-field:nth-child(1) { animation-delay: 0.2s; }
.login-form .login-field:nth-child(2) { animation-delay: 0.28s; }
.login-form .login-field:nth-child(3) { animation-delay: 0.36s; }
.login-form .login-field:nth-child(4) { animation-delay: 0.44s; }

.login-field label {
    display: block;
    margin-bottom: 0.4rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--login-text);
}

.login-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.login-input-wrap .login-input-icon {
    position: absolute;
    left: 1rem;
    color: var(--login-muted);
    font-size: 0.95rem;
    pointer-events: none;
    transition: color 0.2s ease;
}

.login-input-wrap input {
    width: 100%;
    height: 48px;
    padding: 0 2.75rem 0 2.75rem;
    font-size: 0.9375rem;
    font-family: inherit;
    color: var(--login-text);
    background: #f8fafc;
    border: 1.5px solid var(--login-border);
    border-radius: 10px;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.login-input-wrap input::placeholder {
    color: #94a3b8;
}

.login-input-wrap input:hover {
    border-color: #cbd5e1;
}

.login-input-wrap input:focus {
    background: #fff;
    border-color: var(--login-accent);
    box-shadow: 0 0 0 4px var(--login-accent-soft);
}

.login-input-wrap:focus-within .login-input-icon {
    color: var(--login-accent);
}

.login-toggle-pw {
    position: absolute;
    right: 0.75rem;
    padding: 0.35rem;
    background: none;
    border: none;
    color: var(--login-muted);
    cursor: pointer;
    border-radius: 6px;
    transition: color 0.2s ease, background 0.2s ease;
}

.login-toggle-pw:hover {
    color: var(--login-primary);
    background: rgba(4, 41, 84, 0.06);
}

.login-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    animation: login-fade-up 0.6s ease-out 0.4s both;
}

.login-remember {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--login-muted);
    user-select: none;
}

.login-remember input {
    width: 1rem;
    height: 1rem;
    accent-color: var(--login-primary);
    cursor: pointer;
}

.login-submit {
    width: 100%;
    height: 50px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    color: #fff;
    background: linear-gradient(135deg, var(--login-primary) 0%, var(--login-primary-light) 100%);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 14px rgba(4, 41, 84, 0.35);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    animation: login-fade-up 0.6s ease-out 0.48s both;
}

.login-submit::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    transition: left 0.5s ease;
}

.login-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(4, 41, 84, 0.4);
}

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

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

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

.login-submit.is-loading .login-submit-text {
    opacity: 0;
}

.login-submit.is-loading .login-submit-spinner {
    display: block;
}

.login-submit-spinner {
    display: none;
    width: 22px;
    height: 22px;
    border: 2px solid rgba(255, 255, 255, 0.35);
    border-top-color: #fff;
    border-radius: 50%;
    animation: login-spin 0.7s linear infinite;
}

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

.login-footer-note {
    margin: 1.5rem 0 0;
    text-align: center;
    font-size: 0.75rem;
    color: var(--login-muted);
}

.login-footer-note i {
    margin-right: 0.25rem;
    color: #22c55e;
}

/* Responsive */
@media (max-width: 991px) {
    .login-scene {
        flex-direction: column;
    }

    .login-brand {
        flex: 0 0 auto;
        padding: 1.75rem 1.5rem 0.5rem;
    }

    .login-visual {
        max-width: 380px;
    }

    .login-float-img--1 {
        left: 0;
    }

    .login-float-img--2 {
        right: 0;
    }

    .login-panel {
        flex: 1;
        padding: 1.5rem 1.25rem 2.5rem;
        background: transparent;
    }

    .login-card {
        max-width: 440px;
    }
}

@media (max-width: 479px) {
    .login-card {
        padding: 2rem 1.5rem;
    }

    .login-brand {
        padding: 1.25rem 1rem 0;
    }

    .login-visual {
        max-width: 300px;
    }

    .login-float-img--3 {
        display: none;
    }
}

.login-body--auth-only .login-scene--centered {
    justify-content: center;
}

.login-panel--solo {
    flex: 1 1 auto;
    max-width: 100%;
}

.login-panel--solo .login-card {
    max-width: 440px;
}

.view-only-badge {
    display: inline-block;
    padding: 0.25rem 0.6rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: #0b4776;
    background: #e0f2fe;
    border-radius: 6px;
}

.student-view-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.student-view-photo {
    max-width: 120px;
    border-radius: 8px;
    border: 1px solid var(--login-border);
}

.remark-item {
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    background: #f8fafc;
    border-left: 3px solid var(--login-primary);
    border-radius: 0 8px 8px 0;
}

@media (prefers-reduced-motion: reduce) {
    .login-orb,
    .login-card-logo,
    .login-submit::before,
    .login-float-img,
    .login-hero-img {
        animation: none;
    }

    .login-brand,
    .login-visual,
    .login-card,
    .login-form .login-field,
    .login-options,
    .login-submit,
    .login-alert {
        animation: none;
    }
}