@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    /* Brand Colors */
    --color-primary: #2e7d4c;
    --color-primary-light: #52a874;
    --color-primary-dark: #1f5c36;
    --color-secondary: #24A1DE;
    --color-bg: #F8FAFC;

    /* UI Colors */
    --color-white: #ffffff;
    --color-text-main: #0f172a;
    --color-text-muted: #475569;
    --color-border: #e2e8f0;
    --color-shadow: rgba(0, 0, 0, 0.05);
    --color-danger: #dc2626;
    --color-danger-light: #fee2e2;

    /* Status Colors */
    --status-impartida-bg: #dcfce7;
    --status-impartida-text: #166534;
    --status-por-impartir-bg: #e0f2fe;
    --status-por-impartir-text: #075985;
    --status-vacia-bg: #f1f5f9;
    --status-vacia-text: #475569;

    --radius-md: 12px;
    --radius-lg: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* --- OVERLAYS & MODALS --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    background-color: rgba(15, 23, 42, 0.4);
    opacity: 1;
    transition: opacity 0.3s ease, visibility 0.3s;
}

.modal-overlay.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

#overlay-loading {
    background-color: rgba(248, 250, 252, 0.6);
}

/* Modal Cards */
.modal-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    padding: 32px;
    width: 100%;
    margin: 20px;
    display: flex;
    flex-direction: column;
}

.modal-small {
    max-width: 400px;
}

.modal-large {
    max-width: 600px;
    max-height: 90vh;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-header h2 {
    font-size: 1.3rem;
    color: var(--color-text-main);
}

.btn-close-modal {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-text-muted);
    cursor: pointer;
}

.btn-close-modal:hover {
    color: var(--color-text-main);
}

.modal-body {
    flex: 1;
    overflow-y: auto;
    padding-right: 8px;
    margin-bottom: 24px;
}

.modal-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 24px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: 16px;
    cursor: pointer;
}

/* Spinner Animation */
.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--color-primary-light);
    border-top: 4px solid var(--color-primary-dark);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

.btn-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid var(--color-white);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: inline-block;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

.overlay-text {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-primary-dark);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.6;
    }
}

/* Unauthorized Card */
.auth-card {
    background: var(--color-white);
    padding: 40px;
    border-radius: var(--radius-lg);
    text-align: center;
    max-width: 400px;
    border-top: 4px solid var(--color-error);
}

.auth-card h2 {
    color: var(--color-text-main);
    margin-bottom: 12px;
    font-size: 1.5rem;
}

.auth-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* --- MAIN LAYOUT (Sidebar + Content) --- */
.layout-wrapper {
    display: flex;
    min-height: 100vh;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

.sidebar {
    width: 240px;
    background: transparent;
    border-right: none;
    display: flex;
    flex-direction: column;
    padding: 32px 24px 32px 0;
    position: sticky;
    top: 0;
    height: 100vh;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--color-primary-dark);
    margin-bottom: 40px;
}

.logo-image {
    height: 42px;
    width: auto;
    object-fit: contain;
}

.logo-text {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.sidebar-nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.telegram-status-text {
    margin-top: 8px;
    padding-left: 14px;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.telegram-status-text span {
    font-weight: 600;
}

.telegram-status-text .status-yes {
    color: var(--color-primary);
}

.telegram-status-text .status-no {
    color: var(--color-danger);
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

#btn-global-save {
    width: 100%;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(46, 125, 76, 0.2);
    padding: 14px 20px;
    font-size: 1.05rem;
    font-weight: 600;
}

#btn-global-save svg {
    width: 20px;
    height: 20px;
}

#btn-global-save:disabled {
    box-shadow: none;
    transform: none;
}

.sidebar-menu-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 12px 16px;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    /* rectangular with rounded corners */
    color: var(--color-text-main);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    /* very subtle distinct shadow */
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
    font-family: inherit;
}

.sidebar-menu-btn:hover {
    background: rgba(46, 125, 76, 0.06);
    /* subtle green tint on hover */
    border-color: rgba(46, 125, 76, 0.2);
    transform: translateY(-1px);
    /* slight interactive lift */
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.08);
    /* slightly deeper shadow on hover */
}

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

.sidebar-menu-btn svg {
    color: var(--color-primary-dark);
    transition: var(--transition);
}

.sidebar-menu-btn:hover svg {
    color: var(--color-primary-dark);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    max-width: 900px;
    margin: 0;
    padding: 32px 24px;
}

/* SIDEBAR GREETING BADGE */
.sidebar-greeting {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text-main);
    padding: 0;
    /* Removed padding */
    background: transparent;
    /* Removed badge background */
    border: none;
    /* Removed border */
    margin: -16px 0 32px 0;
    /* Flush-left alignment (0px margin) */
    display: inline-flex;
    align-items: center;
    gap: 6px;
    width: fit-content;
}

.sidebar-greeting span {
    color: var(--color-primary-dark);
    font-weight: 700;
}

/* BOTONES GLOBALES */
.btn-action,
.btn-ghost,
.btn-primary,
.btn-danger,
.btn-telegram {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 300;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-action {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    color: var(--color-text-main);
}

.btn-action:hover {
    background: var(--color-white);
    border-color: var(--color-primary-light);
    color: var(--color-primary);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-muted);
}

.btn-ghost:hover {
    background: var(--color-bg);
    color: var(--color-text-main);
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-dark);
}

.btn-telegram {
    background: var(--color-secondary);
    color: var(--color-white);
    border: 1px solid var(--color-secondary);
}

.btn-telegram:hover {
    background: #1d82b3;
    border-color: #1d82b3;
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--color-text-muted);
}

.btn-danger {
    background: var(--color-danger);
    color: var(--color-white);
}

.btn-danger:hover {
    filter: brightness(0.9);
}

/* TABS */
.tabs-container {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding-bottom: 8px;
    margin-bottom: 16px;
}

.tab-btn {
    background: var(--color-white);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    padding: 10px 20px;
    border-radius: 30px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.tab-btn:hover {
    border-color: var(--color-primary-light);
    color: var(--color-primary);
}

.tab-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
    box-shadow: 0 4px 12px rgba(46, 125, 76, 0.3);
}

/* SUBJECT SCHEDULE */
.subject-schedule {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    padding: 0 4px 16px 4px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.subject-schedule svg {
    width: 16px;
    height: 16px;
}

/* CLASSES LIST */
.classes-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* CLASS CARD */
.class-card {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: 20px 24px 16px 24px;
    box-shadow: 0 4px 6px -1px var(--color-shadow);
    border-left: 4px solid transparent;
    transition: var(--transition);
    position: relative;
}

.class-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.08);
}

/* Card Status Styles (Replaced Alternating Themes) */
.class-card.status-por-impartir {
    border-left-color: var(--color-secondary);
}

.class-card.status-impartida {
    border-left-color: var(--color-primary-light);
}

/* Card Impartida Subdued (Grayscale for Elegant Submersion, 0.8 Opacity for High Contrast) */
.class-card.status-impartida {
    opacity: 0.8;
    filter: grayscale(100%);
    box-shadow: none;
    border-top: 1px solid var(--color-border);
    border-right: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.class-card.status-impartida:hover {
    opacity: 1;
    /* Mantenemos el filtro grayscale para evitar destellos visuales (ruido), pero subimos la opacidad como feedback de interacción */
    box-shadow: 0 4px 6px -1px var(--color-shadow);
}

/* Card Header */
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
    gap: 16px;
}

.class-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-main);
    line-height: 1.3;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-delete-class {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.7;
    transition: var(--transition);
}

.btn-delete-class:hover {
    opacity: 1;
    background: var(--color-danger-light);
    color: var(--color-danger);
}

.status-badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.status-badge:hover {
    filter: brightness(0.95);
    transform: scale(1.02);
}

/* Badges based strictly on actual status */
.class-card.status-por-impartir .status-badge {
    background: var(--status-por-impartir-bg);
    color: var(--status-por-impartir-text);
}

.class-card.status-impartida .status-badge {
    background: var(--status-impartida-bg);
    color: var(--status-impartida-text);
}

.impartida-date {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    font-weight: normal;
    text-transform: none;
    letter-spacing: normal;
}

/* Editable Contents */
.editable-content {
    outline: none;
    border-radius: 4px;
    padding: 2px 4px;
    margin: -2px -4px;
    transition: background-color 0.2s, box-shadow 0.2s;
}

.editable-content:hover {
    background-color: rgba(0, 0, 0, 0.03);
}

.editable-content:focus {
    background-color: var(--color-white);
}

/* Color de focus condicional al estado de la tarjeta */
.class-card.status-por-impartir .editable-content:focus {
    box-shadow: 0 0 0 2px var(--color-secondary);
}

.class-card.status-impartida .editable-content:focus {
    box-shadow: 0 0 0 2px var(--color-primary-light);
}


/* Card Body */
.class-description {
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--color-text-main);
    line-height: 1.5;
    margin-bottom: 12px;
}

/* Compromisos section */
.commitments-section {
    background: #f8fafc;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    margin-bottom: 12px;
    transition: var(--transition);
}

.commitments-section.is-empty {
    background: transparent;
    border-color: transparent;
    padding: 6px 8px;
    margin-bottom: 8px;
    margin-left: -8px;
    width: fit-content;
    cursor: pointer;
}

.commitments-section.is-empty:hover {
    background: #f1f5f9;
}

.section-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-main);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: var(--transition);
}

.commitments-section.is-empty .section-title {
    margin-bottom: 0;
    color: var(--color-text-muted);
}

.title-content {
    display: flex;
    align-items: center;
    gap: 6px;
}

.add-icon {
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--color-text-muted);
    margin-left: 8px;
    display: inline-flex;
    align-items: center;
    line-height: 1;
    position: relative;
    top: -1.5px;
    /* Ajuste óptico para alinearse con texto en mayúsculas */
}

.commitments-section:not(.is-empty) .toggle-commitments {
    cursor: default;
}

.commitments-section.is-empty .toggle-commitments {
    cursor: pointer;
}

/* Comments section */
.comments-container {
    margin-top: 12px;
}

.comments-trigger {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    display: none;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    padding: 4px 0;
    transition: var(--transition);
    width: fit-content;
}

.comments-container.is-empty .comments-trigger {
    display: inline-flex;
}

.comments-trigger:hover {
    opacity: 1;
    color: var(--color-primary);
}

.comments-section {
    padding: 10px 14px;
    border-radius: var(--radius-md);
    background: rgba(0, 0, 0, 0.02);
}

.comments-text {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* Forms in Calendar */
.config-subject-block {
    background: #f8fafc;
    border: 1px solid var(--color-border);
    padding: 16px;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
}

.config-subject-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    gap: 12px;
}

.config-subject-header h4 {
    font-size: 1rem;
    color: var(--color-text-main);
    flex: 1;
}

.subject-name-input {
    width: 100%;
    max-width: 300px;
    font-weight: 600;
}

.schedule-item {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
    align-items: center;
}

.schedule-input {
    padding: 6px 10px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 0.9rem;
    font-family: inherit;
    background: var(--color-white);
}

.schedule-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px var(--color-primary-light);
}

.time-selector-group {
    display: flex;
    align-items: center;
    gap: 4px;
}

.time-selector-group span {
    font-weight: bold;
    color: var(--color-text-muted);
}

.btn-icon-danger {
    background: none;
    border: none;
    color: var(--color-danger);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
}

.btn-icon-danger:hover {
    background: var(--color-danger-light);
}

/* Utilities */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--color-text-muted);
    font-size: 1.1rem;
    font-weight: 500;
}

/* Responsive */
@media (max-width: 768px) {
    .layout-wrapper {
        flex-direction: column;
        padding: 0 16px;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: static;
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        padding: 24px 0;
        background: transparent;
        border-bottom: 1px solid var(--color-border);
    }

    .logo-container {
        margin-bottom: 0;
    }

    .main-content {
        padding: 24px 0;
    }

    .sidebar-footer {
        margin-top: 0;
        padding-top: 0;
        border-top: none;
    }

    #btn-global-save {
        padding: 8px 12px;
    }

    #btn-global-save span {
        /* Si queremos ocultar el texto en móvil, pero no pusimos span, así que lo dejamos así */
        display: none;
    }
}

/* ADD SESSION BUTTON & CONTAINER */
.add-session-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 32px;
    padding-bottom: 48px;
}

.add-session-container.hidden {
    display: none;
}

.btn-add-session {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background-color: var(--color-primary);
    color: var(--color-white);
    font-size: 2rem;
    font-weight: 300;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 14px rgba(46, 125, 76, 0.35);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    outline: none;
    line-height: 1;
}

.btn-add-session:hover {
    background-color: var(--color-primary-dark);
    transform: scale(1.1) rotate(90deg);
    /* Beautiful rotating badge effect */
    box-shadow: 0 6px 20px rgba(46, 125, 76, 0.5);
}

.btn-add-session:active {
    transform: scale(0.95) rotate(90deg);
}

/* KEYFRAMES FOR HIGHLIGHT CARD */
@keyframes highlightCard {
    0% {
        box-shadow: 0 0 0 4px rgba(46, 125, 76, 0.4);
        transform: scale(1.02);
    }

    100% {
        box-shadow: 0 4px 6px -1px var(--color-shadow);
        transform: scale(1);
    }
}

/* CONTENTEDITABLE PLACEHOLDER */
.editable-content[placeholder]:empty:before {
    content: attr(placeholder);
    color: var(--color-text-muted);
    opacity: 0.5;
}

/* GLOBAL EMPTY STATE */
.global-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-top: 80px;
    color: var(--color-text-muted);
    opacity: 0.6;
    text-align: center;
}

.global-empty-state.hidden {
    display: none;
}

.global-empty-state svg {
    width: 54px;
    height: 54px;
}

.global-empty-state p {
    font-size: 1.15rem;
    font-weight: 500;
    line-height: 1.5;
    max-width: 320px;
}