/* ==========================================================================
   OkraLinux 官网 — 自定义样式
   说明：Tailwind 负责通用工具类；此文件仅承载 Tailwind 无法表达的效果
        （渐变文字、玻璃质感、时间轴、粒子、终端等）。
   ========================================================================== */

/* ---------- 毛玻璃质感 ---------- */
.glass {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}
.dark .glass {
    background: rgba(17, 24, 39, 0.7);
}

/* ---------- 渐变文字 ---------- */
.gradient-text {
    background: linear-gradient(135deg, #16a34a 0%, #059669 50%, #0d9488 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.dark .gradient-text {
    background: linear-gradient(135deg, #4ade80 0%, #34d399 50%, #2dd4bf 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ---------- 首屏光晕背景 ---------- */
.hero-gradient {
    background: radial-gradient(ellipse at top, rgba(34, 197, 94, 0.15) 0%, transparent 50%),
                radial-gradient(ellipse at bottom, rgba(13, 148, 136, 0.1) 0%, transparent 50%);
}
.dark .hero-gradient {
    background: radial-gradient(ellipse at top, rgba(34, 197, 94, 0.1) 0%, transparent 50%),
                radial-gradient(ellipse at bottom, rgba(13, 148, 136, 0.08) 0%, transparent 50%);
}

/* ---------- 返回顶部按钮 ---------- */
#back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 3rem;
    height: 3rem;
    border-radius: 9999px;
    background: linear-gradient(135deg, #16a34a, #0d9488);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 25px -5px rgba(22, 163, 74, 0.4);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
    z-index: 40;
}
#back-to-top.visible {
    opacity: 1;
    pointer-events: auto;
}
#back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 15px 30px -5px rgba(22, 163, 74, 0.6);
}

/* ---------- 时间轴（路线图） ---------- */
.timeline {
    position: relative;
    padding-left: 2rem;
}
.timeline::before {
    content: '';
    position: absolute;
    left: 0.5rem;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, #22c55e, #0d9488);
}
.timeline-item {
    position: relative;
    padding-bottom: 2rem;
}
.timeline-item:last-child {
    padding-bottom: 0;
}
.timeline-item::before {
    content: '';
    position: absolute;
    left: -1.75rem;
    top: 0.25rem;
    width: 1rem;
    height: 1rem;
    border-radius: 9999px;
    background: #22c55e;
    box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.2);
}

/* 状态色自分支 */
.timeline-item.in-progress::before {
    background: #f59e0b;
    box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.2);
    animation: okraPulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}
.timeline-item.planned::before {
    background: #9ca3af;
    box-shadow: 0 0 0 4px rgba(156, 163, 175, 0.2);
}

@keyframes okraPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.45; }
}

/* ---------- 首屏浮动粒子 ---------- */
.particles {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}
.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(34, 197, 94, 0.5);
    border-radius: 50%;
    animation: particleFloat 15s linear infinite;
}
@keyframes particleFloat {
    0%   { transform: translateY(0) translateX(0); opacity: 0; }
    10%  { opacity: 1; }
    90%  { opacity: 1; }
    100% { transform: translateY(-100vh) translateX(100px); opacity: 0; }
}

/* ---------- 滚动渐现 ---------- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}
.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- 特性卡片：光带扫过 ---------- */
.feature-card {
    position: relative;
    overflow: hidden;
}
.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(34, 197, 94, 0.1), transparent);
    transition: left 0.5s ease;
}
.feature-card:hover::before {
    left: 100%;
}

/* ---------- 终端光标 ---------- */
.terminal-cursor {
    display: inline-block;
    width: 8px;
    height: 18px;
    background: #22c55e;
    vertical-align: text-bottom;
    animation: cursorBlink 1s step-end infinite;
}
@keyframes cursorBlink {
    0%, 50%   { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* ---------- 终端逐行淡入 ---------- */
.term-line {
    opacity: 0;
    animation: lineIn 0.45s ease-out forwards;
}
@keyframes lineIn {
    from { opacity: 0; transform: translateY(4px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ---------- 可访问性：选区与键盘焦点 ---------- */
::selection {
    background: rgba(34, 197, 94, 0.28);
}
:focus-visible {
    outline: 2px solid #16a34a;
    outline-offset: 2px;
    border-radius: 4px;
}

/* ---------- 细滚动条 ---------- */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(120, 130, 140, 0.35);
    border-radius: 9999px;
    border: 2px solid transparent;
    background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(34, 197, 94, 0.6);
    background-clip: content-box;
}

/* ---------- 尊重系统「减弱动态效果」偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto !important;
    }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    .particles {
        display: none !important;
    }
    .reveal {
        opacity: 1 !important;
        transform: none !important;
    }
    .term-line {
        opacity: 1 !important;
        animation: none !important;
    }
}