/* ---
    [P3-LD-002] & [P3-LD-003]
    基本样式、布局、SVG进度条样式
--- */

/* CSS 变量 */
:root {
    --font-sans: 'Segoe UI', 'Roboto', 'Helvetica Neue', 'Arial', 'sans-serif';
    --font-mono: 'Courier New', 'monospace';
    
    /* 颜色方案 - 更接近截图的配色 */
    --color-bg: #eef3fb;
    --color-text: #2d3748;
    --color-text-light: #718096;
    --color-surface: #ffffff;
    --color-border: #e2e8f0;

    /* 颜色主题 - 更接近截图的配色 */
    --color-ready: #6c63ff;
    --color-breathe: #4dabf7;
    --color-hold: #fb923c;
    --color-done: #4ade80;
    
    --color-button-bg: #6c63ff;
    --color-button-text: #fff;
    --color-button-hover-bg: #5a51e0;

    /* 阴影 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.07), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-inner: inset 0 2px 4px rgba(0, 0, 0, 0.05);
    
    --border-radius: 12px;
    --border-radius-lg: 16px;
    --border-radius-full: 9999px;
    --transition-fast: all 0.3s ease-in-out;
}

/* 全局与基础样式 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    height: 100%;
}

body {
    font-family: var(--font-sans);
    min-height: 100vh;
    padding: 1.5rem;
    line-height: 1.6;
    background: linear-gradient(135deg, #eef3fb 0%, #e5eeff 100%);
    color: var(--color-text);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* 布局与组件样式 */
.app-header, .app-footer {
    text-align: center;
    max-width: 500px;
    margin: 0 auto;
}

.app-header {
    margin-bottom: 2rem;
}

.app-header h1 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, #6c63ff 0%, #4dabf7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
}

.app-header h1 .fas {
    font-size: 1.2em;
    margin-right: 0.5rem;
    color: #6c63ff;
    -webkit-text-fill-color: #6c63ff;
}

.description {
    color: var(--color-text-light);
    font-size: 0.95rem;
    max-width: 400px;
    margin: 0 auto;
}

.app-footer {
    margin-top: 2rem;
    font-size: 0.85rem;
    color: var(--color-text-light);
}

.app-footer a {
    color: var(--color-ready);
    text-decoration: none;
    transition: var(--transition-fast);
    font-weight: 500;
}

.app-footer a:hover {
    text-decoration: underline;
    color: var(--color-button-hover-bg);
}

.timer-container {
    background-color: var(--color-surface);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    width: 100%;
    max-width: 480px;
    border: 1px solid rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    animation: fadeIn 0.6s ease-out forwards;
}

.timer-container:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg), 0 15px 30px -10px rgba(0, 0, 0, 0.1);
}

/* 设置区域 */
.settings {
    display: flex;
    justify-content: space-between;
    width: 100%;
    gap: 1.5rem;
    transition: var(--transition-fast);
    background-color: rgba(246, 249, 252, 0.5);
    border-radius: var(--border-radius);
    padding: 1.25rem;
}

.settings.hidden {
    opacity: 0;
    transform: translateY(-20px);
    height: 0;
    overflow: hidden;
    margin-bottom: -2rem;
    padding: 0;
}

.setting-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    min-width: 90px;
}

.setting-item label {
    font-weight: 500;
    color: var(--color-text);
    display: flex;
    align-items: center;
}

.setting-item label .fas {
    margin-right: 0.4rem;
    color: #6c63ff;
}

select {
    font-family: var(--font-sans);
    padding: 0.5rem 1rem;
    width: 100%;
    min-width: 70px;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: var(--color-surface);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-fast);
    cursor: pointer;
    text-align: center;
}

select:hover, select:focus {
    border-color: var(--color-ready);
    box-shadow: 0 0 0 2px rgba(108, 99, 255, 0.1);
}

/* 自定义复选框 */
.sound-checkbox {
    appearance: none;
    -webkit-appearance: none;
    width: 3rem;
    height: 1.5rem;
    background-color: #e2e8f0;
    border-radius: var(--border-radius-full);
    position: relative;
    cursor: pointer;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-inner);
}

.sound-checkbox::before {
    content: '';
    position: absolute;
    width: 1.2rem;
    height: 1.2rem;
    border-radius: 50%;
    top: 0.15rem;
    left: 0.15rem;
    background-color: white;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-fast);
}

.sound-checkbox:checked {
    background-color: var(--color-ready);
}

.sound-checkbox:checked::before {
    transform: translateX(1.5rem);
}

/* 计时器核心 */
.timer {
    position: relative;
    width: 280px;
    height: 280px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0.5rem 0;
}

.progress-ring {
    transform: rotate(-90deg);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.progress-ring__bg {
    fill: none;
    stroke: rgba(226, 232, 240, 0.6);
    stroke-width: 14;
    stroke-linecap: round;
}

.progress-ring__fg {
    fill: none;
    stroke: var(--color-ready);
    stroke-width: 14;
    stroke-linecap: round;
    transition: stroke-dashoffset 1s linear, stroke 0.5s ease-in-out;
    filter: drop-shadow(0 0 5px rgba(108, 99, 255, 0.5));
}

.timer-display {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 1rem;
}

.phase-name {
    font-size: 1.5rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 0.75rem;
    color: var(--color-ready);
    transition: color 0.5s ease-in-out;
}

.time-left {
    font-family: var(--font-mono);
    font-size: 4rem;
    font-weight: 300;
    line-height: 1;
    margin-bottom: 0.75rem;
    position: relative;
    color: #333;
}

.time-left::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    width: 40px;
    height: 2px;
    background: currentColor;
    transform: translateX(-50%) scaleX(0);
    transition: transform 0.3s ease;
    opacity: 0.3;
}

.timer:hover .time-left::after {
    transform: translateX(-50%) scaleX(1);
}

.phase-instruction {
    font-size: 0.9rem;
    color: var(--color-text-light);
    max-width: 200px;
    text-align: center;
    font-style: italic;
    opacity: 0.8;
}

/* 图标样式 */
.fas, .fab {
    margin-right: 0.4rem;
}

.control-btn .fas {
    font-size: 0.9em;
}

/* 控制按钮 */
.control-btn {
    font-family: var(--font-sans);
    font-size: 1.2rem;
    font-weight: 600;
    padding: 0.9rem 3rem;
    border: none;
    border-radius: var(--border-radius-full);
    background: linear-gradient(135deg, #6c63ff 0%, #5a51e0 100%);
    color: var(--color-button-text);
    cursor: pointer;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-md);
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.control-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.control-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.3), var(--shadow-md);
}

.control-btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 5px;
    height: 5px;
    background: rgba(255, 255, 255, 0.7);
    opacity: 0;
    border-radius: 100%;
    transform: scale(1, 1) translate(-50%, -50%);
    transform-origin: 50% 50%;
}

.control-btn:active::after {
    animation: ripple 0.6s ease-out;
}

/* 动画效果 */
@keyframes ripple {
    0% {
        transform: scale(0, 0);
        opacity: 0.5;
    }
    100% {
        transform: scale(20, 20);
        opacity: 0;
    }
}

@keyframes breatheAnimation {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(77, 171, 247, 0);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 30px 5px rgba(77, 171, 247, 0.3);
    }
    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(77, 171, 247, 0);
    }
}

@keyframes holdAnimation {
    0% {
        box-shadow: 0 0 15px 2px rgba(251, 146, 60, 0.2);
    }
    50% {
        box-shadow: 0 0 25px 5px rgba(251, 146, 60, 0.4);
    }
    100% {
        box-shadow: 0 0 15px 2px rgba(251, 146, 60, 0.2);
    }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.timer.breathe-active {
    animation: breatheAnimation 4s infinite ease-in-out;
}

.timer.hold-active {
    animation: holdAnimation 2s infinite ease-in-out;
}

/* 增强过渡效果 */
.phase-name, .time-left, .phase-instruction {
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 添加GitHub链接样式 */
.github-link {
    margin-top: 0.5rem;
    font-size: 0.85rem;
}

.github-link a {
    color: #333;
    text-decoration: none;
    transition: var(--transition-fast);
    display: inline-flex;
    align-items: center;
    padding: 0.3rem 0.8rem;
    background-color: #f6f8fa;
    border: 1px solid #e1e4e8;
    border-radius: var(--border-radius);
}

.github-link a:hover {
    background-color: #f3f4f6;
    text-decoration: none;
    color: #000;
}

.github-link .fab {
    font-size: 1.1em;
}

/* 响应式布局 */
@media (max-width: 480px) {
    body {
        padding: 1rem;
    }
    
    .timer-container {
        padding: 1.5rem;
        max-width: 100%;
    }

    .app-header h1 {
        font-size: 1.8rem;
    }

    .settings {
        flex-direction: column;
        align-items: stretch;
        padding: 1rem;
    }

    .setting-item {
        flex-direction: row;
        justify-content: space-between;
        min-width: auto;
    }
    
    .timer {
        width: 250px;
        height: 250px;
    }
    
    .time-left {
        font-size: 3.5rem;
    }
}