/* --- CSS-переменные для тем --- */
:root {
    --bg-gradient-start: #e0eafc;
    --bg-gradient-end: #cfdef3;
    --primary: #2B60A5; /* синий */
    --accent: #ff9800; /* оранжевый */
    --container-bg: rgba(255,255,255,0.97);
    --muted: #888888;
    --card-bg: #f4f7fb;
    --weekday-odd: #00a8f1;
    --weekday-even: #ff9900d3;
    --weekday-border-odd: rgba(49,166,255,0.82);
    --weekday-border-even: rgba(248,140,73,0.83);
    --weekday-text: #ffffff;
    --pair-subject: #333333;
    --button: #f1f0ff;
    --button-active: rgba(224,234,252,0.9);
    --button-svg: #2B60A5;
    --shadow: rgba(37,99,235,0.10);
}

/* Тёмная тема (Telegram-like) */
.theme-dark {
    --bg-gradient-start: #0b1220;
    --bg-gradient-end: #071025;
    --primary: #2b61a5;
    --accent: #ff8c42;
    --container-bg: rgba(13,18,28,0.92);
    --muted: #9aa6b2;
    --card-bg: #0f1724;
    --weekday-odd: #2b61a5;
    --weekday-even: #d16002;
    --weekday-border-odd: #3379d4;
    --weekday-border-even: #eb6b21;
    --weekday-text: #dbe9ff;
    --pair-subject: #dbe9ff;
    --button: #121c2c;
    --button-active: #182539;
    --button-svg: rgba(224,234,252,0.9);
    --shadow: rgba(0,0,0,0.5);
}

/* Кнопка возврата наверх */
.scroll-to-top {
    position: fixed;
    right: 18px;
    bottom: 24px;
    width: 56px;
    height: 56px;
    background: rgba(37,99,235,0.08);
    border: none;
    border-radius: 50%;
    box-shadow: 0 2px 8px rgba(37,99,235,0.07);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s cubic-bezier(.4,0,.2,1), background 0.18s, transform 0.13s;
    z-index: 99;
    color: var(--primary);
}
.scroll-to-top > svg > circle {
    fill: var(--button);
}
.scroll-to-top > svg > path {
    stroke: var(--button-svg);
}
.scroll-to-top.visible {
    opacity: 0.7;
    pointer-events: auto;
    transform: translateY(0);
}
.scroll-to-top:hover {
    background: var(--button);
    opacity: 1;
    transform: scale(1.08);
}
.scroll-to-top:active {
    background: var(--button);
    opacity: 1;
    transform: scale(0.97);
}
.scroll-to-top svg {
    display: block;
}
/* Кнопки переключения недели */
.week-switch-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 18px;
}
.week_button {
    display: inline-block;
    padding: 8px 18px;
    background: var(--primary);
    color: #fff;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    box-shadow: 0 2px 8px rgba(37,99,235,0.10);
    transition: background 0.18s, transform 0.12s;
    border: none;
}
.current-button {
    background: #7d7c91;
}
.week_button:hover {
    background: #2B60A5;
    transform: scale(1.04);
}
.week_button:active {
    background: #ff9800;
    color: #fff;
    transform: scale(0.97);
}
.theme-toggle {
    position: absolute;
    top: 14px;
    right: 12px;
    width: 40px;
    height: 34px;
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 18px;
    line-height: 1;
}
.theme-toggle:focus { outline: 2px solid rgba(37,99,235,0.2); border-radius: 6px; }
.nav_buttons--teachers {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.no-teachers {
    text-align: center;
    color: #ff9800;
    margin: 24px 0;
    font-size: 1.1rem;
    font-weight: 600;
}

/* Логотип */
.logo-ineb {
    display: block;
    margin: 0 auto 18px auto;
    max-width: 110px;
    height: auto;
    filter: drop-shadow(0 2px 8px var(--shadow));
}

.container {
    max-width: 400px;
    margin: 0 auto;
    padding: 32px 16px 24px 16px;
    box-sizing: border-box;
    background: var(--container-bg);
    border-radius: 18px;
    box-shadow: 0 4px 24px var(--shadow);
    margin-top: 24px;
    position: relative;
}

.back_button {
    position: absolute;
    top: 14px;
    left: 10px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    z-index: 2;
    border-radius: 50%;
    transition: background 0.18s, box-shadow 0.18s, transform 0.12s;
    box-shadow: 0 2px 8px rgba(37,99,235,0.07);
}
.back_button > svg > circle {
    fill: var(--button);
}
.back_button:hover {
    background: var(--button);
    box-shadow: 0 4px 16px rgba(37,99,235,0.13);
    transform: scale(1.07);
}
.back_button svg {
    display: block;
}
.back_button > svg > path {
    stroke: var(--button-svg);
}
.back_button:active {
    background: var(--button-active);
    transform: scale(0.97);
}

h2 {
    text-align: center;
    color: var(--primary);
    margin-bottom: 32px;
    font-size: 2rem;
    letter-spacing: 1px;
}

.nav_buttons--groups {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.redirect_button {
    display: block;
    width: 100%;
    padding: 16px 0;
    background-color: var(--primary);
    color: #fff;
    text-align: center;
    border-radius: 12px;
    font-size: 1.2rem;
    font-weight: 600;
    text-decoration: none;
    box-shadow: 0 4px 16px rgba(37,99,235,0.13);
    transition: background 0.2s, transform 0.1s;
    letter-spacing: 0.5px;
}
.redirect_button:active {
    background-color: #5E91D2;
    transform: scale(0.98);
}

/* --- Расписание --- */
.weekday-block {
    margin-bottom: 28px;
    border-radius: 20px;
    padding-bottom: 28px;
}
.weekday-block:nth-child(odd) {
    background-color: var(--weekday-odd);
    border: solid 3px var(--weekday-border-odd);
}
.weekday-block:nth-child(even) {
    background-color: var(--weekday-even);
    border: solid 3px var(--weekday-border-even);
}

.weekday-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--weekday-text);
    margin-bottom: 10px;
    letter-spacing: 0.5px;
    text-align: center;
}
.pairs-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.pair-card {
    background-color: var(--card-bg);
    border-radius: 14px;
    box-shadow: 0 2px 10px rgba(37,99,235,0.08);
    padding: 14px 16px 10px 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    border: 1.5px solid #2563eb22;
}
.pair-row {
    display: flex;
    align-items: center;
    font-size: 1rem;
}
.pair-row--top {
    justify-content: space-between;
    font-size: 0.98rem;
    color: #7DA2D2;
    margin-bottom: 2px;
}
.pair-row--middle {
    justify-content: space-between;
}
.pair-row--footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.97em;
    margin-top: 4px;
}
.pair-num {
    font-weight: 700;
    min-width: 22px;
    color: var(--primary);
}
.pair-teacher {
    color: #888;
    font-weight: 500;
}
.pair-students-group {
    color: #38acff;
    font-size: 1.1em;
    font-weight: 400;
    margin-left: 12px;
    white-space: nowrap;
    align-self: flex-end;
}
.pair-subject {
    font-weight: 600;
    color: var(--pair-subject);
    font-size: 1.05em;
    margin-bottom: 2px;
    letter-spacing: 0.2px;
    word-break: break-word;
    width: 277px;
    max-width: 277px;
    
}
.pair-time-vertical {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: center;
    min-width: 48px;
    gap: 2px;
}
.pair-time {
    font-family: 'Segoe UI', Arial, sans-serif;
    font-size: 0.97em;
    color: var(--primary);
    margin: 0 8px;
    width: 111px;
}
.pair-classroom {
    color: #38acff;
    font-size: 0.97em;
    font-weight: 500;
}


/* Сообщение об отсутствии групп */
.no-groups {
    text-align: center;
    color: #888;
    margin: 24px 0;
    font-size: 1.1rem;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Arial, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
}





@media (max-width: 480px) {
    .container {
        padding: 16px 4px;
    }
    h2 {
        font-size: 1.3rem;
        margin-bottom: 20px;
    }
    .redirect_button {
        font-size: 1rem;
        padding: 12px 0;
    }
    .logo-ineb {
        max-width: 80px;
        margin-bottom: 12px;
    }
    .pair-card {
        padding: 10px 7px 8px 10px;
    }
    .pair-row {
        font-size: 0.97rem;
    }
        .nav_buttons--teachers {
        gap: 10px;
    }
}