/* style.css —— 简易论坛系统页面样式 */
* {
    box-sizing: border-box;
}

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --danger: #dc2626;
    --text: #1f2937;
    --muted: #6b7280;
    --border: #e5e7eb;
    --bg: #f3f6fb;
    --card: #ffffff;
    --shadow: 0 16px 35px rgba(15, 23, 42, 0.08);
}

body {
    margin: 0;
    font-family: "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: radial-gradient(circle at top left, #dbeafe 0, transparent 36%), var(--bg);
    min-height: 100vh;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.site-header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.nav-wrap {
    max-width: 980px;
    margin: 0 auto;
    padding: 14px 22px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.logo {
    font-size: 22px;
    font-weight: 800;
    color: var(--primary-dark);
}

.nav-links {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 14px;
    font-size: 14px;
}

.nav-user {
    color: var(--muted);
}

.link-danger {
    color: var(--danger);
}

.container {
    width: min(980px, calc(100% - 32px));
    margin: 30px auto;
}

.hero {
    background: linear-gradient(135deg, #1d4ed8, #60a5fa);
    color: white;
    padding: 34px;
    border-radius: 24px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 20px;
}

.hero.small {
    padding: 26px 32px;
}

.hero h1 {
    margin: 0 0 8px;
    font-size: 30px;
}

.hero p {
    margin: 0;
    opacity: 0.92;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 18px;
    box-shadow: var(--shadow);
}

.form-card {
    max-width: 520px;
    margin: 0 auto;
    padding: 28px;
}

.form-card.wide {
    max-width: 760px;
}

.form-card h2 {
    margin-top: 0;
}

label {
    display: block;
    font-weight: 700;
    margin: 14px 0 8px;
}

input,
textarea {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 14px;
    font-size: 15px;
    font-family: inherit;
    outline: none;
    transition: border 0.2s, box-shadow 0.2s;
    background: #fff;
}

input:focus,
textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

textarea {
    resize: vertical;
    line-height: 1.7;
}

button,
.link-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: 12px;
    padding: 10px 18px;
    cursor: pointer;
    font-size: 15px;
    font-family: inherit;
    transition: transform 0.16s, box-shadow 0.16s, background 0.16s;
}

button:hover,
.link-button:hover {
    transform: translateY(-1px);
    text-decoration: none;
}

.primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.22);
}

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

.full {
    width: 100%;
    margin-top: 20px;
}

.ghost {
    background: #eef2ff;
    color: var(--primary-dark);
}

.danger {
    background: #fee2e2;
    color: var(--danger);
}

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

.password-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 8px;
}

.error,
.flash {
    padding: 12px 14px;
    border-radius: 12px;
    margin: 0 0 16px;
}

.error {
    color: #991b1b;
    background: #fee2e2;
}

.flash.success {
    color: #065f46;
    background: #d1fae5;
}

.flash.warning {
    color: #92400e;
    background: #fef3c7;
}

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

.center {
    text-align: center;
}

.list-hero {
    align-items: flex-end;
}

.toolbar {
    padding: 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    margin-bottom: 16px;
}

.toolbar input {
    max-width: 420px;
}

.message-list {
    display: grid;
    gap: 14px;
}

.message {
    padding: 20px;
}

.message-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 12px;
}

.message-head strong {
    color: var(--primary-dark);
    display: block;
    margin-bottom: 4px;
}

.message-head time {
    color: var(--muted);
    font-size: 13px;
}

.message-body {
    margin: 14px 0 0;
    line-height: 1.8;
    white-space: normal;
}

.empty {
    padding: 28px;
    color: var(--muted);
    text-align: center;
}

.form-tools {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 12px;
}

.site-footer {
    text-align: center;
    color: var(--muted);
    padding: 24px;
}

@media (max-width: 720px) {
    .nav-wrap,
    .hero,
    .toolbar,
    .message-head,
    .form-tools {
        flex-direction: column;
        align-items: stretch;
    }

    .hero h1 {
        font-size: 24px;
    }

    .form-card {
        padding: 20px;
    }

    .toolbar input {
        max-width: none;
    }
}