/* ===========================================
   户外夏令营管理系统 v1.0.0
   Outdoor Camp Theme - Mobile First
   =========================================== */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700;900&family=Lobster&display=swap');

/* ===== CSS Variables ===== */
:root {
    --green-dark: #1a5c32;
    --green: #2d8a4e;
    --green-light: #4caf50;
    --green-pale: #e8f5e9;
    --orange: #f5a623;
    --orange-light: #fff3e0;
    --blue: #4a90d9;
    --blue-light: #e3f2fd;
    --brown: #795548;
    --brown-light: #efebe9;
    --red: #e53935;
    --text-dark: #263238;
    --text: #455a64;
    --text-light: #78909c;
    --bg: #f5f7f5;
    --white: #ffffff;
    --shadow: 0 4px 24px rgba(0,0,0,.08);
    --shadow-hover: 0 8px 40px rgba(0,0,0,.12);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: all .3s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

a { color: var(--green); text-decoration: none; }
a:hover { color: var(--green-dark); }
img { max-width: 100%; height: auto; }
ul { list-style: none; }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--green-light); border-radius: 3px; }

/* ===== Hero / Header ===== */
.hero {
    position: relative;
    background: linear-gradient(160deg, #1a5c32 0%, #2d8a4e 35%, #43a047 70%, #66bb6a 100%);
    padding: 48px 24px 56px;
    text-align: center;
    color: var(--white);
    overflow: visible;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    /* clip-path polygon makes angled bottom edge */
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 32px), 0 100%);
    margin-bottom: -2px;
}

/* Decorative light spots */
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80vw 30vw at 15% 85%, rgba(255,255,255,.10) 0%, transparent 60%),
        radial-gradient(ellipse 50vw 40vw at 85% 15%, rgba(255,255,255,.07) 0%, transparent 55%);
    pointer-events: none;
    z-index: 0;
}

/* Subtle pattern overlay */
.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 25% 25%, rgba(255,255,255,.04) 1px, transparent 1px),
        radial-gradient(circle at 75% 75%, rgba(255,255,255,.04) 1px, transparent 1px);
    background-size: 40px 40px, 60px 60px;
    pointer-events: none;
    z-index: 0;
}

/* Wave bottom decoration */
.hero-wave {
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 40px;
    z-index: 1;
    pointer-events: none;
    line-height: 0;
}

.hero-wave svg {
    display: block;
    width: 100%;
    height: 40px;
    fill: var(--bg);
}

.hero-icon {
    font-size: 42px;
    margin-bottom: 12px;
    animation: float 3s ease-in-out infinite;
    position: relative;
    z-index: 1;
    filter: drop-shadow(0 4px 8px rgba(0,0,0,.15));
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.hero h1 {
    font-size: clamp(22px, 5vw, 38px);
    font-weight: 900;
    letter-spacing: 2px;
    text-shadow: 0 2px 12px rgba(0,0,0,.2);
    position: relative;
    z-index: 1;
    line-height: 1.3;
    max-width: 400px;
    padding: 0 4px;
}

.hero .subtitle {
    font-size: clamp(15px, 3vw, 20px);
    font-weight: 300;
    margin-top: 6px;
    opacity: .92;
    letter-spacing: 6px;
    position: relative;
    z-index: 1;
}

.hero .badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--orange), #ff8f00);
    color: var(--white);
    padding: 5px 24px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 700;
    margin-top: 14px;
    position: relative;
    z-index: 1;
    box-shadow: 0 4px 14px rgba(245, 166, 35, .35);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); box-shadow: 0 4px 14px rgba(245, 166, 35, .35); }
    50% { transform: scale(1.05); box-shadow: 0 6px 24px rgba(245, 166, 35, .45); }
}


/* ===== Container ===== */
.container {
    max-width: 480px;
    margin: 0 auto;
    padding: 20px 16px 32px;
    position: relative;
    z-index: 2;
}

@media (min-width: 600px) {
    .container {
        max-width: 600px;
        padding: 28px 20px 40px;
    }
}

/* ===== Section ===== */
.section {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin: 16px 0;
    padding: 24px 20px;
    transition: var(--transition);
}

.section:hover {
    box-shadow: var(--shadow-hover);
}

.section-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--green-dark);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding-bottom: 12px;
    border-bottom: 3px solid var(--green-pale);
}

.section-title .icon {
    font-size: 24px;
}

/* ===== Info Cards ===== */
.info-grid {
    display: grid;
    gap: 12px;
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 14px;
    background: var(--green-pale);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.info-item .info-icon {
    font-size: 20px;
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--white);
    border-radius: 50%;
    box-shadow: 0 2px 8px rgba(45, 138, 78, .15);
}

.info-item .info-label {
    font-size: 12px;
    color: var(--text-light);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.info-item .info-value {
    font-size: 15px;
    color: var(--text-dark);
    font-weight: 500;
    margin-top: 2px;
}

/* ===== Course Cards ===== */
.course-card {
    border: 2px solid #e0e8e0;
    border-radius: var(--radius-sm);
    padding: 18px 16px;
    margin-bottom: 16px;
    transition: var(--transition);
    position: relative;
}

.course-card:hover {
    border-color: var(--green-light);
}

.course-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.course-card h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--green-dark);
}

.course-fee {
    font-size: 22px;
    font-weight: 900;
    color: var(--orange);
    white-space: nowrap;
}

.course-fee small {
    font-size: 13px;
    font-weight: 400;
    color: var(--text-light);
}

.course-desc {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 12px;
}

/* ===== Option Grid ===== */
.option-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin: 10px 0;
}

.option-item {
    position: relative;
}

.option-item input[type="radio"] {
    display: none;
}

.option-item label {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px 8px;
    border: 2px solid #e0e8e0;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    min-height: 44px;
    background: var(--white);
}

.option-item input[type="radio"]:checked + label {
    border-color: var(--green);
    background: var(--green-pale);
    color: var(--green-dark);
    box-shadow: 0 0 0 3px rgba(45, 138, 78, .15);
}

.option-item label:active {
    transform: scale(.97);
}

/* ===== Days Selector ===== */
.days-selector {
    display: flex;
    gap: 10px;
    margin: 12px 0;
}

.days-btn {
    flex: 1;
    padding: 12px 8px;
    border: 2px solid #e0e8e0;
    border-radius: var(--radius-sm);
    background: var(--white);
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.days-btn:hover {
    border-color: var(--green-light);
}

.days-btn.active {
    border-color: var(--green);
    background: var(--green-pale);
    color: var(--green-dark);
}

.days-btn small {
    display: block;
    font-size: 12px;
    font-weight: 400;
    color: var(--text-light);
    margin-top: 4px;
}

/* ===== Fee Summary ===== */
.fee-summary {
    background: linear-gradient(135deg, var(--orange-light), #fff8e1);
    border-radius: var(--radius-sm);
    padding: 16px;
    margin: 16px 0;
    text-align: center;
}

.fee-summary .total-label {
    font-size: 14px;
    color: var(--text-light);
}

.fee-summary .total-amount {
    font-size: 36px;
    font-weight: 900;
    color: var(--orange);
    margin: 4px 0;
}

.fee-summary .total-amount small {
    font-size: 18px;
    font-weight: 400;
}

.fee-summary .total-detail {
    font-size: 13px;
    color: var(--text);
    opacity: .7;
}

/* ===== Form ===== */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 6px;
}

.form-group label .required {
    color: var(--red);
    margin-left: 2px;
}

.form-control {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid #e0e8e0;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-family: inherit;
    color: var(--text-dark);
    background: var(--white);
    transition: var(--transition);
    -webkit-appearance: none;
    appearance: none;
}

.form-control:focus {
    outline: none;
    border-color: var(--green);
    box-shadow: 0 0 0 3px rgba(45, 138, 78, .12);
}

.form-control::placeholder {
    color: #b0bec5;
}

textarea.form-control {
    resize: vertical;
    min-height: 80px;
}

/* ===== Location ===== */
.location-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--blue-light);
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--blue);
    min-height: 44px;
    margin-bottom: 16px;
}

.location-bar .loc-icon {
    font-size: 18px;
    flex-shrink: 0;
}

.location-bar .loc-status {
    flex: 1;
}

.location-bar .loc-status.loading {
    opacity: .6;
}

.location-bar .loc-btn {
    padding: 6px 14px;
    background: var(--blue);
    color: var(--white);
    border: none;
    border-radius: 6px;
    font-size: 12px;
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition);
}

.location-bar .loc-btn:hover {
    background: #357abd;
}

.location-bar .loc-btn:disabled {
    opacity: .5;
    cursor: not-allowed;
}

/* ===== Submit Button ===== */
.btn-submit {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--green) 0%, var(--green-light) 100%);
    color: var(--white);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 18px;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 2px;
    margin-top: 8px;
    position: relative;
    overflow: hidden;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(45, 138, 78, .35);
}

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

.btn-submit:disabled {
    opacity: .6;
    cursor: not-allowed;
    transform: none;
}

.btn-submit .loading-spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-top-color: var(--white);
    border-radius: 50%;
    animation: spin .6s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.btn-submit.loading .btn-text { display: none; }
.btn-submit.loading .loading-spinner { display: block; }

/* ===== Success Toast ===== */
.toast {
    display: none;
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--green-dark);
    color: var(--white);
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 500;
    z-index: 2000;
    box-shadow: 0 8px 32px rgba(0,0,0,.2);
    animation: toastIn .3s ease;
    max-width: 90%;
    text-align: center;
}

.toast.show { display: block; }

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* ===== Footer ===== */
.footer {
    background: var(--green-dark);
    color: rgba(255,255,255,.7);
    text-align: center;
    padding: 30px 20px 20px;
    font-size: 13px;
    line-height: 1.8;
}

.footer a {
    color: var(--orange);
}

/* ===== Loading Skeleton ===== */
.skeleton {
    background: linear-gradient(90deg, #e0e8e0 25%, #f0f5f0 50%, #e0e8e0 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 4px;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ===== Responsive ===== */
@media (min-width: 768px) {
    .container { max-width: 600px; padding: 32px 24px 0; }
    .hero { padding: 64px 32px 72px; }
    .hero h1 { font-size: 40px; max-width: 500px; }
    .hero-wave { height: 52px; }
    .hero-wave svg { height: 52px; }
    .hero-icon { font-size: 52px; }
    .section { padding: 32px 28px; }
    .option-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 360px) {
    .option-grid { grid-template-columns: 1fr; }
    .days-selector { flex-direction: column; }
}

/* ===== Admin Styles ===== */
body.admin-body {
    background: #f0f2f5;
}

.admin-nav {
    background: var(--green-dark);
    color: var(--white);
    padding: 0 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.admin-nav .nav-brand {
    font-size: 18px;
    font-weight: 700;
    color: var(--white);
}

.admin-nav .nav-links {
    display: flex;
    gap: 8px;
}

.admin-nav .nav-links a {
    color: rgba(255,255,255,.8);
    padding: 8px 12px;
    font-size: 14px;
    border-radius: 6px;
    transition: var(--transition);
}

.admin-nav .nav-links a:hover,
.admin-nav .nav-links a.active {
    background: rgba(255,255,255,.15);
    color: var(--white);
}

.admin-panel {
    max-width: 900px;
    margin: 24px auto;
    padding: 0 16px;
}

.admin-card {
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 24px;
    margin-bottom: 20px;
    overflow-x: auto;
}

.admin-card h2 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid #f0f0f0;
}

/* Admin Table */
.admin-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.admin-table th {
    text-align: left;
    padding: 10px 12px;
    background: #f8f9fa;
    color: var(--text);
    font-weight: 600;
    border-bottom: 2px solid #e0e0e0;
    white-space: nowrap;
}

.admin-table td {
    padding: 10px 12px;
    border-bottom: 1px solid #f0f0f0;
    color: var(--text-dark);
}

.admin-table tr:hover td {
    background: #f8fbf8;
}

.status-badge {
    display: inline-block;
    padding: 3px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.status-badge.unpaid {
    background: #fff3e0;
    color: #e65100;
}

.status-badge.paid {
    background: var(--green-pale);
    color: var(--green-dark);
}

.status-badge.pending {
    background: var(--blue-light);
    color: var(--blue);
}

.btn-action {
    padding: 6px 14px;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    cursor: pointer;
    font-family: inherit;
    transition: var(--transition);
}

.btn-action.mark-paid {
    background: var(--green);
    color: var(--white);
}

.btn-action.mark-paid:hover {
    background: var(--green-dark);
}

.btn-action.delete {
    background: var(--red);
    color: var(--white);
}

.btn-action.delete:hover {
    background: #c62828;
}

/* Admin Form */
.admin-form .form-group {
    margin-bottom: 20px;
}

.admin-form .form-group label {
    font-weight: 600;
    color: var(--text-dark);
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
}

.admin-form .form-control {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #d0d0d0;
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    transition: var(--transition);
}

.admin-form .form-control:focus {
    border-color: var(--green);
    outline: none;
    box-shadow: 0 0 0 3px rgba(45,138,78,.1);
}

.admin-form textarea.form-control {
    min-height: 120px;
}

.btn-save {
    padding: 12px 32px;
    background: var(--green);
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: var(--transition);
}

.btn-save:hover {
    background: var(--green-dark);
}

/* Login Page */
.login-page {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, var(--green-dark), var(--green));
    padding: 20px;
}

.login-box {
    background: var(--white);
    border-radius: var(--radius);
    padding: 40px 32px;
    width: 100%;
    max-width: 380px;
    box-shadow: 0 20px 60px rgba(0,0,0,.2);
}

.login-box h1 {
    font-size: 24px;
    color: var(--green-dark);
    text-align: center;
    margin-bottom: 24px;
}

.login-box .form-group {
    margin-bottom: 20px;
}

.login-box .form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text);
}

.login-box .form-control {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: var(--transition);
}

.login-box .form-control:focus {
    border-color: var(--green);
    outline: none;
    box-shadow: 0 0 0 3px rgba(45,138,78,.1);
}

.login-box .btn-login {
    width: 100%;
    padding: 14px;
    background: var(--green);
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
}

.login-box .btn-login:hover {
    background: var(--green-dark);
}

.login-box .error-msg {
    color: var(--red);
    font-size: 14px;
    text-align: center;
    margin-bottom: 16px;
    padding: 10px;
    background: #ffebee;
    border-radius: 6px;
    display: none;
}

/* ===== Checkbox Style ===== */
.checkbox-group {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 12px 0;
}

.checkbox-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--green);
    cursor: pointer;
}

.checkbox-group label {
    font-size: 14px;
    color: var(--text);
    cursor: pointer;
    user-select: none;
}

/* ===== Link Button ===== */
.link-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--blue);
    font-size: 14px;
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
    padding: 4px 0;
    transition: var(--transition);
}

.link-btn:hover {
    color: #357abd;
}

/* ===== QR Upload Preview ===== */
.qr-preview {
    margin: 12px 0;
    max-width: 200px;
    border: 2px dashed var(--green-pale);
    border-radius: 8px;
    padding: 8px;
}

.qr-preview img {
    display: block;
    width: 100%;
}

/* ===== Summary Section ===== */
.summary-box {
    background: linear-gradient(135deg, var(--green-pale), #f1f8e9);
    border: 2px solid var(--green);
    border-radius: var(--radius-sm);
    padding: 20px;
    margin: 16px 0;
}

.summary-box h4 {
    color: var(--green-dark);
    font-size: 16px;
    margin-bottom: 12px;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    font-size: 14px;
    border-bottom: 1px dashed rgba(0,0,0,.08);
}

.summary-row:last-child {
    border-bottom: none;
}

.summary-row .label { color: var(--text); }
.summary-row .value { font-weight: 600; color: var(--text-dark); }
.summary-row.total { border-top: 2px solid var(--green); margin-top: 8px; padding-top: 10px; }
.summary-row.total .value { color: var(--orange); font-size: 18px; }

/* ===== Print Styles ===== */
@media print {
    .hero, .footer, .btn-submit, .location-bar { display: none; }
    .section { box-shadow: none; border: 1px solid #ddd; break-inside: avoid; }
}