@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@600&display=swap');

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

:root {
    --primary-blue: #7CB9E8;
    --light-blue: #E8F4F8;
    --bg-gradient: linear-gradient(135deg, #E8F4F8 0%, #D4E8F0 100%);
    --text-primary: #2D3748;
    --text-secondary: #718096;
    --white: #FFFFFF;
    --gray-light: #9CA3AF;
    --gray: #6B7280;
    --shadow: 0 20px 60px rgba(124, 185, 232, 0.15);
    --card-bg: rgba(255, 255, 255, 0.95);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: url('/assets/back.png') center center / cover no-repeat fixed;
    background-color: #E8F4F8;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    overflow-x: hidden;
}

/* Фоновые декоративные круги */
.background-circles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.circle {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(124, 185, 232, 0.15) 0%, rgba(124, 185, 232, 0.05) 70%);
    animation: float 20s infinite ease-in-out;
}

.circle-1 {
    width: 120px;
    height: 120px;
    top: 10%;
    left: 8%;
    animation-delay: 0s;
    background: rgba(124, 185, 232, 0.1);
}

.circle-2 {
    width: 60px;
    height: 60px;
    top: 60%;
    left: 15%;
    animation-delay: 2s;
    background: rgba(124, 185, 232, 0.08);
}

.circle-3 {
    width: 80px;
    height: 80px;
    top: 20%;
    right: 10%;
    animation-delay: 4s;
    background: rgba(124, 185, 232, 0.12);
}

.circle-4 {
    width: 100px;
    height: 100px;
    bottom: 15%;
    right: 15%;
    animation-delay: 1s;
    background: rgba(124, 185, 232, 0.09);
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0) translateX(0);
    }

    25% {
        transform: translateY(-20px) translateX(10px);
    }

    50% {
        transform: translateY(-10px) translateX(-10px);
    }

    75% {
        transform: translateY(-30px) translateX(5px);
    }
}

/* Контейнер */
.container {
    width: 100%;
    max-width: 600px;
    position: relative;
    z-index: 1;
}

/* Карточка */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border-radius: 32px;
    padding: 60px 50px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: background-color 0.35s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)),
                box-shadow 0.35s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1));
}

/* The logo sits above the card, not inside it: .page-stack groups the two
   as one centered unit (body does the centering), so the card holds only
   the form. Shared by the welcome, teacher and admin-login pages. */
.page-stack {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    position: relative;
    z-index: 1;
}

.page-logo {
    display: flex;
    animation: slideDown 0.6s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1));
}

.page-logo img {
    display: block;
    width: min(148px, 60vw);
    height: auto;
    filter: drop-shadow(0 4px 12px rgba(124, 185, 232, 0.3));
}

/* Заголовок */
.title {
    font-family: 'Montserrat', sans-serif;
    font-size: 36px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
    line-height: 1.15;
    animation: slideDown 0.6s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)) 0.1s both;
    transition: color 0.3s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1));
}

/* Подзаголовок */
.subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-weight: 400;
    animation: slideDown 0.6s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)) 0.2s both;
    transition: opacity 0.3s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)),
                transform 0.3s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)),
                color 0.3s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1));
    min-height: 24px;
}

.subtitle.fade-out {
    opacity: 0;
    transform: translateY(-10px);
}

.subtitle.fade-in {
    animation: fadeIn 0.4s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)) forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Контейнер поиска */
.search-container {
    position: relative;
    margin-bottom: 24px;
    animation: slideDown 0.6s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)) 0.3s both;
}

.search-input {
    width: 100%;
    padding: 18px 60px 18px 20px;
    border: 2px solid transparent;
    border-radius: 16px;
    font-size: 16px;
    color: var(--text-primary);
    background: rgba(248, 250, 252, 0.8);
    transition: background-color 0.25s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)),
                border-color 0.25s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)),
                box-shadow 0.25s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)),
                color 0.25s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1));
    outline: none;
}

.search-input::placeholder {
    color: var(--gray-light);
}

.search-input:focus {
    background: var(--white);
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 4px rgba(124, 185, 232, 0.1);
}

.search-button {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.25s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)),
                transform 0.15s ease-out;
}

.search-button:hover {
    background: rgba(124, 185, 232, 0.1);
}

.search-button:active {
    transform: translateY(-50%) scale(0.9);
}

/* Список вариантов */
.suggestions-list {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    transform-origin: top center;
    background: var(--white);
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    overflow-y: auto;
    overflow-x: hidden;
    scrollbar-width: none;
    -ms-overflow-style: none;
    max-height: 200px;
    z-index: 10;
    border: 1px solid rgba(124, 185, 232, 0.2);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-6px) scale(0.98);
    transition: opacity 0.2s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)),
                transform 0.2s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)),
                visibility 0s linear 0.2s;
}

.suggestions-list::-webkit-scrollbar {
    display: none;
}

.suggestions-list:not(.hidden) {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0) scale(1);
    transition: opacity 0.2s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)),
                transform 0.2s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)),
                visibility 0s linear 0s;
}

.suggestion-item {
    padding: 14px 20px;
    font-size: 15px;
    color: var(--text-primary);
    cursor: pointer;
    text-align: left;
    transition: background-color 0.2s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)),
                color 0.2s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)),
                padding-left 0.2s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1));
    border-bottom: 1px solid rgba(0, 0, 0, 0.03);
}

.suggestion-item:last-child {
    border-bottom: none;
}

.suggestion-item:hover {
    background: rgba(124, 185, 232, 0.1);
    color: var(--primary-blue);
    padding-left: 24px;
}

.suggestion-item:active {
    background: rgba(124, 185, 232, 0.2);
}

/* Кнопка "Назад" */
.back-button {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    margin-left: -12px;
    background: transparent;
    border: none;
    color: var(--gray);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    border-radius: 12px;
    transition: background-color 0.2s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)),
                color 0.2s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)),
                transform 0.12s ease-out;
    margin-bottom: 8px;
    margin-right: auto;
    width: fit-content;
    animation: slideDown 0.6s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1));
}

.back-button:hover {
    background: rgba(124, 185, 232, 0.08);
    color: var(--text-primary);
}

.back-button:active {
    transform: scale(0.97);
}

.teacher-link {
    display: flex;
    align-items: center;
    gap: 8px;
    width: fit-content;
    margin: 20px auto 0;
    padding: 11px 20px;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.16);
    border-radius: 999px;
    color: #2563eb;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    animation: slideDown 0.6s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1));
    transition: transform 0.2s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)),
                box-shadow 0.2s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1)),
                background-color 0.3s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1));
}

.teacher-link svg {
    flex-shrink: 0;
    transition: transform 0.2s var(--ease-spring, cubic-bezier(0.22, 1, 0.36, 1));
}

.teacher-link:hover {
    background: rgba(59, 130, 246, 0.16);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.18);
}

.teacher-link:hover svg:last-child {
    transform: translateX(3px);
}

.teacher-link:active {
    transform: translateY(0) scale(0.96);
    transition: transform 0.1s ease-out;
}

[data-theme="dark"] .teacher-link {
    background: rgba(59, 130, 246, 0.16);
    border-color: rgba(96, 165, 250, 0.25);
    color: #93c5fd;
}

[data-theme="dark"] .teacher-link:hover {
    background: rgba(59, 130, 246, 0.24);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.35);
}

.back-button.hidden {
    display: none;
}

/* Адаптивность для планшетов */
@media (max-width: 768px) {
    .card {
        padding: 50px 40px;
        border-radius: 28px;
    }

    .title {
        font-size: 32px;
    }

    .subtitle {
        font-size: 15px;
    }
}

/* Адаптивность для мобильных */
@media (max-width: 480px) {
    body {
        padding: 16px;
    }

    .card {
        padding: 40px 24px;
        border-radius: 24px;
    }

    .page-stack { gap: 16px; }

    .page-logo img { width: min(128px, 50vw); }

    .title {
        font-size: 26px;
        margin-bottom: 12px;
    }

    .subtitle {
        font-size: 14px;
        margin-bottom: 32px;
    }

    .search-input {
        padding: 16px 56px 16px 20px;
        font-size: 16px;
        border-radius: 14px;
    }

    .search-button {
        width: 40px;
        height: 40px;
    }

    .search-button svg {
        width: 18px;
        height: 18px;
    }

    .back-button {
        padding: 8px 12px;
        margin-left: -12px;
        font-size: 14px;
    }

    .circle-1 {
        width: 80px;
        height: 80px;
    }

    .circle-2 {
        width: 40px;
        height: 40px;
    }

    .circle-3 {
        width: 60px;
        height: 60px;
    }

    .circle-4 {
        width: 70px;
        height: 70px;
    }
}

/* Очень маленькие экраны */
@media (max-width: 360px) {
    .card {
        padding: 32px 20px;
    }

    .title {
        font-size: 24px;
    }

    .subtitle {
        font-size: 13px;
    }

    .search-input {
        font-size: 16px;
    }
}

/* Dark theme */
[data-theme="dark"] body {
    background-color: #0f172a;
    background-image: none;
}
[data-theme="dark"] .card {
    background: #1e293b;
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
[data-theme="dark"] .title { color: #f1f5f9; }
[data-theme="dark"] .subtitle { color: #94a3b8; }
[data-theme="dark"] .search-input {
    background: #0f172a;
    color: #f1f5f9;
    border-color: #334155;
}
[data-theme="dark"] .search-input::placeholder { color: #475569; }
[data-theme="dark"] .search-input:focus {
    background: #0f172a;
    border-color: #3b82f6;
    box-shadow: 0 0 0 4px rgba(59,130,246,0.15);
}
[data-theme="dark"] .suggestions-list {
    background: #1e293b;
    border-color: #334155;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}
[data-theme="dark"] .suggestion-item { color: #f1f5f9; border-bottom-color: #334155; }
[data-theme="dark"] .suggestion-item:hover { background: rgba(59,130,246,0.12); color: #60a5fa; }
[data-theme="dark"] .back-button { color: #94a3b8; }
[data-theme="dark"] .back-button:hover { background: rgba(255,255,255,0.06); color: #f1f5f9; }
[data-theme="dark"] .circle { opacity: 0.15; }

/* Reduced motion: people who turn motion down in their OS get instant state
   changes instead of slides, springs and the endlessly floating circles. */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}