/* ============================================================
   IWantLearn Blog · 基础样式（复用 iwantlearn 金色主题）
   ============================================================ */

/* 主题变量 */
:root {
    --gold: #d4a017;
    --gold-light: #f5d76e;
    --gold-dark: #c4900e;
    --gold-bg: rgba(212, 160, 23, 0.08);

    --text: #2c3e50;
    --text-sub: #555;
    --text-muted: #888;
    --text-faint: #bbb;

    --bg: #fafafa;
    --bg-card: #ffffff;
    --border: #f0f0f0;
    --border-soft: #f5f5f5;

    --radius: 12px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-gold: 0 4px 16px rgba(212, 160, 23, 0.15);
}

/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

/* 金色流光动画 */
@keyframes goldFlow {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 页面切换淡入动画 */
@keyframes pageFadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

main {
    animation: pageFadeIn 0.4s ease;
}

/* 金色流光文字 */
.gold-text {
    background: linear-gradient(135deg, var(--gold), var(--gold-light), var(--gold));
    background-size: 300% 300%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: goldFlow 4s ease infinite;
}

/* ===== SVG 图标 =====
   用 mask 着色：图标颜色跟随 currentColor，因此按钮 / 链接 / 暗夜模式
   都能自动适配；同一份 /img/*.svg 无需再复制多套配色。 */
.icon {
    display: inline-block;
    width: 1em;
    height: 1em;
    background-color: currentColor;
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-position: center;
    mask-position: center;
    -webkit-mask-size: contain;
    mask-size: contain;
    vertical-align: -0.15em;
    flex-shrink: 0;
}

.icon-eye            { -webkit-mask-image: url('/img/alt-eye.svg');            mask-image: url('/img/alt-eye.svg'); }
.icon-paper-plane    { -webkit-mask-image: url('/img/alt-paper-plane.svg');    mask-image: url('/img/alt-paper-plane.svg'); }
.icon-plus-eye       { -webkit-mask-image: url('/img/alt-plus-eye.svg');       mask-image: url('/img/alt-plus-eye.svg'); }
.icon-pencil         { -webkit-mask-image: url('/img/alt-square-pencil.svg');  mask-image: url('/img/alt-square-pencil.svg'); }
.icon-quill          { -webkit-mask-image: url('/img/alt-square-quill.svg');   mask-image: url('/img/alt-square-quill.svg'); }
.icon-trash          { -webkit-mask-image: url('/img/alt-tag.svg');            mask-image: url('/img/alt-tag.svg'); }
.icon-envelope       { -webkit-mask-image: url('/img/envelope.svg');           mask-image: url('/img/envelope.svg'); }
.icon-like           { -webkit-mask-image: url('/img/like.svg');               mask-image: url('/img/like.svg'); }
.icon-link           { -webkit-mask-image: url('/img/link.svg');               mask-image: url('/img/link.svg'); }
.icon-moon           { -webkit-mask-image: url('/img/moon.svg');               mask-image: url('/img/moon.svg'); }
.icon-paperclip      { -webkit-mask-image: url('/img/paperclip.svg');          mask-image: url('/img/paperclip.svg'); }
.icon-sun            { -webkit-mask-image: url('/img/sun.svg');                mask-image: url('/img/sun.svg'); }
.icon-time           { -webkit-mask-image: url('/img/time.svg');               mask-image: url('/img/time.svg'); }
.icon-user-default   { -webkit-mask-image: url('/img/userS.svg');              mask-image: url('/img/userS.svg'); }
.icon-user           { -webkit-mask-image: url('/img/user.svg');               mask-image: url('/img/user.svg'); }
.icon-hourglass      { -webkit-mask-image: url('/img/hourglass-half.svg');      mask-image: url('/img/hourglass-half.svg'); }
.icon-minus-eye      { -webkit-mask-image: url('/img/alt-minus-eye.svg');       mask-image: url('/img/alt-minus-eye.svg'); }
.icon-circle-exclamation { -webkit-mask-image: url('/img/circle-exclamation.svg'); mask-image: url('/img/circle-exclamation.svg'); }
.icon-circle-check   { -webkit-mask-image: url('/img/circle-exclamation-check.svg'); mask-image: url('/img/circle-exclamation-check.svg'); }
.icon-triangle-exclamation { -webkit-mask-image: url('/img/triangle-exclamation.svg'); mask-image: url('/img/triangle-exclamation.svg'); }
.icon-message-dots   { -webkit-mask-image: url('/img/message-circle-dots.svg'); mask-image: url('/img/message-circle-dots.svg'); }
.icon-message-lines  { -webkit-mask-image: url('/img/message-circle-lines.svg'); mask-image: url('/img/message-circle-lines.svg'); }
.icon-message-arrow  { -webkit-mask-image: url('/img/message-circle-arrow.svg'); mask-image: url('/img/message-circle-arrow.svg'); }
.icon-message-square { -webkit-mask-image: url('/img/message-square.svg'); mask-image: url('/img/message-square.svg'); }
.icon-message-chart  { -webkit-mask-image: url('/img/message-square-chart-lines.svg'); mask-image: url('/img/message-square-chart-lines.svg'); }
.icon-temperature    { -webkit-mask-image: url('/img/temperature.svg'); mask-image: url('/img/temperature.svg'); }
.icon-search         { -webkit-mask-image: url('/img/search-alt.svg'); mask-image: url('/img/search-alt.svg'); }
.icon-latest         { -webkit-mask-image: url('/img/message-square-chart-lines.svg'); mask-image: url('/img/message-square-chart-lines.svg'); }
.icon-tag            { -webkit-mask-image: url('/img/tag.svg'); mask-image: url('/img/tag.svg'); }

/* 默认头像图标：略小于圆形头像容器 */
.user-avatar .icon-user-default {
    width: 56%;
    height: 56%;
    vertical-align: 0;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 24px;
    border: none;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--gold), var(--gold-light));
    color: #fff;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--gold-dark), #e8c85a);
    box-shadow: 0 2px 10px rgba(212, 160, 23, 0.3);
}

.btn-primary:active {
    transform: scale(0.97);
}

.btn-outline {
    background: transparent;
    color: var(--gold);
    border: 1px solid var(--gold);
}

.btn-outline:hover {
    background: var(--gold-bg);
}

.btn-sm {
    padding: 6px 16px;
    font-size: 0.82rem;
}

/* ===== 标签 / 徽章 ===== */
.badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--gold-bg);
    color: var(--gold);
    white-space: nowrap;
}

.badge.muted {
    background: #f2f2f2;
    color: var(--text-muted);
}

/* 标签云单个标签 */
.tag {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 50px;
    font-size: 0.8rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-sub);
    cursor: pointer;
    transition: all 0.25s ease;
}

.tag:hover {
    color: var(--gold);
    border-color: var(--gold-light);
    background: linear-gradient(135deg, #fffef5, #ffffff);
}

/* ===== 卡片 ===== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

/* ===== 侧边栏小组件 ===== */
.widget {
    padding: 20px;
}

.widget + .widget {
    border-top: 1px solid var(--border-soft);
}

.widget-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: #333;
    margin-bottom: 14px;
    padding-left: 12px;
    border-left: 3px solid var(--gold);
}

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

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-sub);
    margin-bottom: 6px;
}

.form-input {
    width: 100%;
    padding: 11px 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 0.92rem;
    color: #333;
    background: var(--bg-card);
    outline: none;
    transition: all 0.25s ease;
    font-family: inherit;
}

.form-input:focus {
    border-color: var(--gold);
    box-shadow: 0 4px 20px rgba(212, 160, 23, 0.12);
}

.form-input::placeholder {
    color: #ccc;
}

textarea.form-input {
    resize: vertical;
    min-height: 90px;
}

/* ===== Toast 交互反馈 ===== */
.toast-container {
    position: fixed;
    top: 76px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3000;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    pointer-events: none;
}

.toast {
    padding: 10px 22px;
    border-radius: 50px;
    font-size: 0.88rem;
    font-weight: 500;
    color: #fff;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
    animation: toastIn 0.3s ease;
    pointer-events: auto;
}

.toast.success { background: #4caf50; }
.toast.error { background: #e05d5d; }
.toast.info { background: var(--gold); }

.toast.hide {
    animation: toastOut 0.3s ease forwards;
}

@keyframes toastIn {
    from { opacity: 0; transform: translateY(-12px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes toastOut {
    from { opacity: 1; transform: translateY(0); }
    to { opacity: 0; transform: translateY(-12px); }
}

/* ===== 加载状态 ===== */
.loading {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid var(--gold-bg);
    border-top-color: var(--gold);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

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