/* Подключаем шрифт */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600;700;800&display=swap');

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

body {
    font-family: 'Montserrat', sans-serif;
    background: linear-gradient(135deg, #0f0f0f 0%, #1a1a1a 100%);
    color: #f0f0f0;
    min-height: 100vh;
    padding: 1rem;
    line-height: 1.6;
}

/* Header */
.main-header {
    background: #151515;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    border-bottom: 2px solid #2ffa98;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-center h1 {
    font-size: clamp(1.2rem, 5vw, 1.8rem);
    color: #2ffa98;
    text-transform: uppercase;
    letter-spacing: 0.1rem;
    text-shadow: 0 0 10px rgba(47, 250, 152, 0.5);
    margin: 0;
}

.admin-btn {
    background: linear-gradient(135deg, #2ffa98 0%, #1cd681 100%);
    color: #000;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 0.05rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(47, 250, 152, 0.4);
    border: none;
    cursor: pointer;
    text-transform: uppercase;
    white-space: nowrap;
}

.admin-btn:hover {
    background: linear-gradient(135deg, #4affad 0%, #2ffa98 100%);
    box-shadow: 0 6px 20px rgba(47, 250, 152, 0.6);
    transform: translateY(-2px);
}

/* Week Controls */
#week-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1.5rem;
    margin: 2rem auto;
    padding: 1rem;
    background: rgba(21, 21, 21, 0.8);
    border-radius: 15px;
    border: 1px solid rgba(47, 250, 152, 0.2);
    max-width: 90%;
    flex-wrap: wrap;
}

.week-btn {
    background: linear-gradient(135deg, #2ffa98 0%, #1cd681 100%);
    color: #000;
    padding: 0.75rem 1rem;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 700;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    min-width: 120px;
    text-align: center;
    font-size: 0.9rem;
}

.home-btn {
    background: linear-gradient(135deg, #ff6b81 0%, #ff4757 100%);
    min-width: auto;
}

.home-btn:hover {
    background: linear-gradient(135deg, #ff8e9d 0%, #ff6b81 100%);
}

.week-btn:hover {
    background: linear-gradient(135deg, #4affad 0%, #2ffa98 100%);
    transform: translateY(-2px);
}

#week-range {
    font-size: clamp(1rem, 4vw, 1.25rem);
    font-weight: 700;
    color: #2ffa98;
    text-shadow: 0 0 10px rgba(47, 250, 152, 0.3);
    padding: 0 1rem;
    white-space: nowrap;
}

/* Tables */
.table-container {
    overflow-x: auto;
    margin: 1rem auto;
    max-width: 100%;
    background: rgba(21, 21, 21, 0.5);
    border-radius: 15px;
    padding: 0.5rem;
}

.schedule-table, #admin-table {
    border-collapse: separate;
    border-spacing: 0;
    margin: 0 auto;
    width: 100%;
    min-width: 600px;
    background: #151515;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 35px rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(47, 250, 152, 0.1);
}

th {
    background: linear-gradient(135deg, #202020 0%, #151515 100%);
    color: #2ffa98;
    padding: 1rem 0.75rem;
    text-align: center;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05rem;
    font-size: 0.85rem;
    border-bottom: 2px solid #2ffa98;
    white-space: nowrap;
}

td {
    border: 1px solid #252525;
    padding: 0.75rem;
    text-align: center;
    transition: all 0.2s ease;
    background: #1a1a1a;
    color: #e0e0e0;
    font-size: 0.9rem;
}

tr:nth-child(even) td {
    background: #151515;
}

tr:hover td {
    background: #202020;
}

/* Editable cells */
td[contenteditable="true"] {
    background: linear-gradient(135deg, #1a1a1a 0%, #151515 100%);
    border: 2px solid #2ffa98;
    border-radius: 8px;
    color: #fff;
    outline: none;
    transition: all 0.3s ease;
    min-width: 50px;
}

td[contenteditable="true"]:focus {
    background: #151515;
    box-shadow: 0 0 0 3px rgba(47, 250, 152, 0.3);
    border-color: #4affad;
}

/* Buttons */
#add-row, #save-btn, button {
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, #2ffa98 0%, #1cd681 100%);
    color: #000;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 700;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    margin: 0.5rem;
    text-transform: uppercase;
    min-width: 120px;
}

#add-row:hover, #save-btn:hover, button:hover {
    background: linear-gradient(135deg, #4affad 0%, #2ffa98 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(47, 250, 152, 0.4);
}

.del-btn {
    background: linear-gradient(135deg, #ff4757 0%, #ff3838 100%);
    color: white;
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    min-width: auto;
}

.del-btn:hover {
    background: linear-gradient(135deg, #ff6b81 0%, #ff4757 100%);
}

/* Login form */
.login-section {
    max-width: 90%;
    margin: 4rem auto;
    padding: 2rem;
    background: rgba(21, 21, 21, 0.9);
    border-radius: 20px;
    border: 1px solid rgba(47, 250, 152, 0.2);
    box-shadow: 0 10px 35px rgba(0, 0, 0, 0.5);
}

.login-section h2 {
    color: #2ffa98;
    text-align: center;
    margin-bottom: 2rem;
    text-transform: uppercase;
    font-size: clamp(1.5rem, 6vw, 2rem);
}

.login-section form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.login-section label {
    color: #e0e0e0;
    font-weight: 600;
}

.login-section input {
    padding: 0.75rem;
    background: #1a1a1a;
    border: 2px solid #252525;
    border-radius: 10px;
    color: #fff;
    font-size: 1rem;
}

.login-section input:focus {
    border-color: #2ffa98;
    outline: none;
    box-shadow: 0 0 0 3px rgba(47, 250, 152, 0.2);
}

.login-section button {
    margin-top: 1rem;
    width: 100%;
}

.error {
    color: #ff4757;
    text-align: center;
    margin-top: 1rem;
    padding: 0.75rem;
    background: rgba(255, 71, 87, 0.1);
    border-radius: 10px;
    font-size: 0.9rem;
}

/* Week label */
.week-label {
    text-align: center;
    font-size: clamp(1.5rem, 5vw, 2.5rem);
    color: #2ffa98;
    margin: 2rem 0;
    text-transform: uppercase;
    letter-spacing: 0.1rem;
    text-shadow: 0 0 15px rgba(47, 250, 152, 0.5);
}

/* Grade colors */
.grade-5 { color: #2ffa98; font-weight: bold; }
.grade-4 { color: #7bed9f; font-weight: bold; }
.grade-3 { color: #ffa502; font-weight: bold; }
.grade-2 { color: #ff6b81; font-weight: bold; }

/* No data message */
.no-data {
    text-align: center;
    padding: 3rem 2rem;
    margin: 2rem auto;
    max-width: 90%;
    background: rgba(21, 21, 21, 0.8);
    border-radius: 15px;
    border: 1px solid rgba(47, 250, 152, 0.2);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.no-data h3 {
    color: #2ffa98;
    margin-bottom: 1rem;
    font-size: clamp(1.2rem, 5vw, 1.8rem);
    text-shadow: 0 0 10px rgba(47, 250, 152, 0.3);
}

.no-data p {
    color: #e0e0e0;
    margin-bottom: 1.5rem;
    font-size: 1rem;
}

/* Info and Recommendations blocks */
.info-block, .recommendations-block {
    text-align: center;
    padding: 2rem;
    margin: 2rem auto;
    max-width: 90%;
    background: rgba(21, 21, 21, 0.8);
    border-radius: 15px;
    border: 1px solid rgba(47, 250, 152, 0.2);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.info-block p, .recommendations-block p {
    color: #e0e0e0;
    font-size: clamp(0.9rem, 3vw, 1.1rem);
    line-height: 1.6;
    margin: 0;
}

.recommendations-block h4 {
    color: #2ffa98;
    margin-bottom: 1rem;
    font-size: clamp(1.1rem, 4vw, 1.4rem);
    text-transform: uppercase;
    text-shadow: 0 0 10px rgba(47, 250, 152, 0.3);
}

.external-link {
    color: #2ffa98;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

.external-link:hover {
    color: #4affad;
    text-decoration: underline;
}

/* Glass effect */
.glass-effect {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 0.5rem;
    }

    .main-header {
        padding: 0.75rem 1rem;
        flex-direction: column;
        gap: 1rem;
    }

    .header-center h1 {
        font-size: 1.2rem;
    }

    #week-controls {
        flex-direction: column;
        gap: 1rem;
        padding: 0.75rem;
    }

    .week-btn {
        min-width: 100%;
        padding: 0.5rem;
    }

    .schedule-table, #admin-table {
        min-width: 500px;
        font-size: 0.8rem;
    }

    th, td {
        padding: 0.5rem;
    }

    .student-col {
        position: sticky;
        left: 0;
        z-index: 2;
        min-width: 100px;
    }

    #add-row, #save-btn {
        width: 100%;
        margin: 0.25rem 0;
    }

    .del-btn {
        padding: 0.25rem 0.5rem;
        font-size: 0.7rem;
    }

    .no-data {
        padding: 2rem 1rem;
        margin: 1rem auto;
    }

    .login-section {
        padding: 1.5rem;
        margin: 2rem auto;
    }
}

@media (max-width: 480px) {
    .schedule-table, #admin-table {
        min-width: 400px;
    }

    th, td {
        padding: 0.4rem;
        font-size: 0.75rem;
    }

    .student-col {
        min-width: 80px;
    }

    td[contenteditable="true"] {
        min-width: 40px;
    }
}