:root {
    --color-primary: #20573b;
    --color-primary-dark: #153626;
    --color-accent: #2f8f5b;
    --color-danger: #b73f34;
    --color-warning: #d98b16;
    --color-info: #2a6f97;
    --color-bg: #eef2ef;
    --color-bg-2: #dde6df;
    --color-card: #ffffff;
    --color-text: #1f2421;
    --color-muted: #5f6d64;
    --border-radius: 14px;
    --spacing: 14px;
    --font-base: 16px;
    --font-large: 18px;
    --font-xl: 22px;
    --layout-max: 400px;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: Inter, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-size: var(--font-base);
    line-height: 1.55;
    background:
        radial-gradient(circle at top left, rgba(32, 87, 59, 0.08), transparent 35%),
        linear-gradient(180deg, #f6f8f6 0%, var(--color-bg) 100%);
    color: var(--color-text);
    min-height: 100vh;
}

.app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    width: min(100%, var(--layout-max));
    margin: 0 auto;
}

.app-header {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fff;
    padding: var(--spacing);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    width: 100%;
    margin: 0 auto;
}

.header-user {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    min-width: 0;
    justify-content: center;
}

.header-user-logo {
    width: 36px;
    height: 36px;
    border-radius: 11px;
    object-fit: cover;
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.22);
    flex: 0 0 auto;
}

.header-user-logo-fallback {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 13px;
    font-weight: 800;
    letter-spacing: 0.03em;
}

.header-user-text {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.header-user-name {
    color: #fff;
    font-size: 14px;
    font-weight: 800;
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.header-user-school {
    color: rgba(255, 255, 255, 0.8);
    font-size: 12px;
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.logo {
    font-size: var(--font-xl);
    font-weight: 700;
    color: #fff;
    text-decoration: none;
    letter-spacing: 0.02em;
}

.app-main {
    flex: 1;
    width: 100%;
    margin: 0 auto;
    padding: 12px;
}

.app-footer {
    text-align: center;
    padding: 12px;
    color: var(--color-muted);
    font-size: 13px;
}

.app-footer-row {
    width: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 0 12px;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.footer-help-link {
    color: var(--color-primary);
    font-weight: 700;
    text-decoration: none;
    white-space: nowrap;
}

.footer-ad-link {
    color: var(--color-warning);
}

.ad-slot {
    display: block;
    text-decoration: none;
    width: 100%;
    margin: 0 auto 10px;
    padding: 0 12px;
}

.ad-slot-content {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 10px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(32, 87, 59, 0.08), rgba(42, 111, 151, 0.08));
    border: 1px dashed rgba(32, 87, 59, 0.18);
    color: var(--color-primary-dark);
    font-size: 14px;
}

.ad-slot-badge {
    flex: 0 0 auto;
    padding: 4px 9px;
    border-radius: 999px;
    background: var(--color-primary);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.ad-slot-text {
    line-height: 1.4;
}

.promo-section {
    width: 100%;
    margin: 4px auto 12px;
    padding: 0;
}

.promo-section-inner {
    padding: 12px;
    border-radius: 14px;
    background:
        radial-gradient(circle at top left, rgba(32, 87, 59, 0.12), transparent 40%),
        linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(234, 244, 239, 0.95));
    border: 1px solid rgba(32, 87, 59, 0.12);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.05);
}

.promo-copy {
    margin-bottom: 12px;
}

.promo-title {
    margin: 0 0 8px 0;
    font-size: 17px;
    line-height: 1.2;
    color: var(--color-primary-dark);
}

.promo-text {
    margin: 0 0 8px 0;
    font-size: 14px;
    line-height: 1.55;
    color: var(--color-text);
}

.promo-text a {
    color: var(--color-primary);
    font-weight: 700;
    text-decoration: none;
}

.promo-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.promo-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 9px;
    border-radius: 14px;
    background: #fff;
    border: 1px solid rgba(32, 87, 59, 0.1);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.04);
}

.promo-image {
    width: 100%;
    height: auto;
    max-height: 160px;
    object-fit: contain;
    border-radius: 14px;
    border: 1px solid rgba(32, 87, 59, 0.08);
    background: #f4f7f4;
    display: block;
}

.promo-card strong {
    font-size: 13px;
    color: var(--color-primary-dark);
}

.promo-card span {
    font-size: 12px;
    line-height: 1.45;
    color: var(--color-muted);
}

.manual-intro {
    font-size: 17px;
    line-height: 1.7;
    color: var(--color-text);
}

.manual-list {
    font-size: 16px;
    line-height: 1.7;
    padding-left: 20px;
}

.manual-list li + li {
    margin-top: 8px;
}

.app-footer a {
    color: var(--color-primary);
    font-weight: 700;
    text-decoration: none;
}

.footer-separator {
    padding: 0 6px;
}

.card {
    background: var(--color-card);
    border-radius: var(--border-radius);
    padding: 12px;
    margin-bottom: 12px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.06);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    margin: 0 0 12px 0;
    color: var(--color-primary-dark);
}

.form-group {
    margin-bottom: 12px;
}

label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 15px;
}

input[type="text"],
input[type="password"],
input[type="number"],
input[type="tel"],
input[type="email"],
input[type="file"],
select,
textarea {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    background: #fff;
    transition: border-color 0.2s;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

textarea {
    min-height: 100px;
    resize: vertical;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 13px 12px;
    font-size: 16px;
    font-weight: 700;
    text-align: center;
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.06);
}

.btn:active {
    transform: scale(0.98);
}

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

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

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

.btn-warning {
    background: var(--color-warning);
    color: #fff;
}

.btn-info {
    background: var(--color-info);
    color: #fff;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    padding: 8px 14px;
    font-size: 16px;
    box-shadow: none;
}

.app-header .btn-outline,
.btn-outline.header-action {
    border-color: rgba(255, 255, 255, 0.85);
    color: #fff;
    background: rgba(255, 255, 255, 0.08);
}

.header-help-pill {
    white-space: nowrap;
}

.header-help-dot {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 54px;
    height: 54px;
    border-radius: 999px;
    background: #ff2d2d;
    color: #fff;
    text-decoration: none;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.02em;
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.12);
}

.header-help-dot:hover {
    filter: brightness(0.96);
}

.btn-small {
    padding: 7px 12px;
    font-size: 13px;
}

.btn-large {
    padding: 16px;
    font-size: 18px;
}

.btn-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-top: 12px;
}

.btn-grid .btn {
    padding: 14px 10px;
    font-size: 18px;
}

.alert {
    padding: 12px;
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing);
    font-weight: 500;
}

.alert-success { background: #d4edda; color: #155724; }
.alert-danger  { background: #f8d7da; color: #721c24; }
.alert-warning { background: #fff3cd; color: #856404; }
.alert-info    { background: #d1ecf1; color: #0c5460; }

.menu-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.menu-grid .btn {
    text-align: left;
    padding: 14px 12px;
}

.summary-box {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    border-radius: var(--border-radius);
    background: #eaf4ef;
    margin-bottom: 8px;
}

.summary-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}

.summary-box.negative {
    background: #fdecea;
}

.summary-label {
    font-size: 14px;
    color: var(--color-muted);
}

.summary-value {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-primary-dark);
}

.summary-box.negative .summary-value {
    color: var(--color-danger);
}

.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

th, td {
    padding: 10px;
    border-bottom: 1px solid #ddd;
    text-align: left;
}

th {
    background: #eaf4ef;
    font-weight: 600;
}

.status-pending  { color: var(--color-warning); font-weight: 600; }
.status-confirmed, .status-active { color: var(--color-primary); font-weight: 600; }
.status-cancelled, .status-blocked { color: var(--color-danger); font-weight: 600; }

.amount-display {
    background: #fff;
    border: 2px solid var(--color-primary);
    border-radius: var(--border-radius);
    padding: 14px;
    font-size: 20px;
    font-weight: 700;
    text-align: right;
    margin-bottom: 12px;
    min-height: 56px;
}

.student-card {
    background: #fff;
    border-radius: var(--border-radius);
    padding: 12px;
    margin-bottom: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.student-card h3 {
    margin: 0 0 4px 0;
    font-size: 17px;
}

.student-meta {
    color: var(--color-muted);
    font-size: 14px;
}

.login-toggle {
    text-align: center;
    margin-top: 16px;
}

.login-toggle a {
    color: var(--color-primary);
    font-weight: 600;
    font-size: 15px;
}

.field-hint {
    margin-top: 6px;
    color: var(--color-muted);
    font-size: 13px;
}

.role-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 110px;
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(32, 87, 59, 0.08);
    color: var(--color-primary);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }

@media (min-width: 768px) {
    .card {
        padding: 20px;
    }

    .app-main {
        padding-top: 20px;
        padding-bottom: 24px;
    }
}

@media (min-width: 360px) {
    .menu-grid,
    .summary-grid,
    .promo-grid,
    .product-grid,
    .student-list {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .product-grid {
        gap: 8px;
    }
}

@media (max-width: 767px) {
    .header-content {
        align-items: flex-start;
        flex-wrap: wrap;
    }

    .header-user {
        order: 3;
        justify-content: flex-start;
        width: 100%;
        margin-top: 6px;
    }

    .ad-slot-content {
        align-items: flex-start;
        flex-direction: column;
    }

    .header-help-pill {
        display: none;
    }

    .app-footer-row {
        flex-direction: column;
        align-items: flex-start;
    }

    .promo-grid {
        grid-template-columns: 1fr;
    }

    .btn-outline.header-action {
        border-color: rgba(255, 255, 255, 0.85);
        background: rgba(255, 255, 255, 0.08);
    }
}

.product-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.operator-product-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.product-card {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 12px;
    border-radius: 14px;
    border: 1px solid rgba(32, 87, 59, 0.12);
    background: linear-gradient(180deg, #ffffff, #f3f8f4);
    text-align: left;
}

.product-card.is-selected {
    background: linear-gradient(180deg, #d9f1e0, #bfe3cc);
    border-color: rgba(32, 87, 59, 0.34);
    box-shadow: 0 0 0 2px rgba(32, 87, 59, 0.12), 0 8px 18px rgba(32, 87, 59, 0.12);
    transform: translateY(-1px);
}

.product-card.is-selected strong,
.product-card.is-selected span {
    color: var(--color-primary-dark);
}

.product-card strong {
    font-size: 15px;
    color: var(--color-primary-dark);
}

.product-card span {
    font-size: 13px;
    color: var(--color-muted);
}

.sale-items {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
}

.student-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}

.letter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 10px;
}

.letter-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 30px;
    padding: 6px 8px;
    border-radius: 999px;
    background: #eef4ef;
    color: var(--color-primary-dark);
    text-decoration: none;
    font-size: 12px;
    font-weight: 700;
}

.letter-chip.active {
    background: var(--color-primary);
    color: #fff;
}

.sale-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 9px;
    border-radius: 999px;
    background: #e7f0ea;
    color: var(--color-primary-dark);
    font-size: 12px;
    font-weight: 700;
}

.sale-stage {
    background: #f7faf8;
    border: 1px solid rgba(32, 87, 59, 0.08);
}

.operator-action-grid {
    grid-template-columns: 1fr;
}

.confirm-blink {
    animation: confirmPulse 1.15s ease-in-out infinite;
    box-shadow: 0 0 0 rgba(32, 87, 59, 0.35);
}

.sell-confirm-blink {
    animation: confirmPulse 1.15s ease-in-out infinite;
    box-shadow: 0 0 0 rgba(32, 87, 59, 0.35);
}

@keyframes confirmPulse {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(32, 87, 59, 0.42);
        filter: brightness(1);
    }
    50% {
        transform: scale(1.02);
        box-shadow: 0 0 0 10px rgba(32, 87, 59, 0);
        filter: brightness(1.12);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(32, 87, 59, 0);
        filter: brightness(1);
    }
}

.credit-card-mini {
    position: relative;
    overflow: hidden;
    padding: 10px 11px;
    border: 1px solid rgba(32, 87, 59, 0.12);
    background:
        radial-gradient(circle at top right, rgba(32, 87, 59, 0.08), transparent 40%),
        linear-gradient(135deg, #ffffff 0%, #eef4ef 100%);
    box-shadow: 0 6px 14px rgba(0, 0, 0, 0.05);
}

.credit-card-mini::after {
    content: '';
    position: absolute;
    inset: auto -20px -18px auto;
    width: 76px;
    height: 76px;
    border-radius: 50%;
    background: rgba(32, 87, 59, 0.08);
}

.credit-card-mini-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    position: relative;
    z-index: 1;
    margin-bottom: 6px;
}

.credit-card-mini-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 32px;
    height: 32px;
    padding: 0 8px;
    border-radius: 11px;
    background: var(--color-primary);
    color: #fff;
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.03em;
}

.credit-card-mini-balance {
    position: relative;
    z-index: 1;
    font-size: 15px;
    color: var(--color-primary-dark);
}

.credit-card-mini h3 {
    position: relative;
    z-index: 1;
    margin-bottom: 2px;
    font-size: 15px;
}

.credit-card-mini .student-meta {
    position: relative;
    z-index: 1;
    margin: 0;
    font-size: 12px;
    color: var(--color-muted);
}