/* ============================================
   Post It — 核心樣式
   ============================================ */

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

:root {
    /* 貼紙顏色 */
    --note-yellow: #FFF176;
    --note-pink: #F48FB1;
    --note-green: #A5D6A7;
    --note-blue: #90CAF9;
    --note-orange: #FFCC80;
    --note-purple: #CE93D8;

    /* UI 顏色 */
    --toolbar-bg: #2c2c2c;
    --toolbar-text: #e0e0e0;
    --board-bg: #e8e4df;
    --board-border: #b0aaa2;
    --board-frame: #8a8a8a;
    --accent: #4A90D9;
    --danger: #e74c3c;

    /* 字型 */
    --font-handwriting: 'Caveat', cursive;
    --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    /* 尺寸 */
    --toolbar-height: 52px;
    --fab-size: 56px;
    --note-min-w: 160px;
    --note-min-h: 140px;
    --note-max-w: 340px;
    --note-max-h: 400px;
}

html, body {
    height: 100%;
    overflow: hidden;
    font-family: var(--font-ui);
    background: #1a1a1a;
    -webkit-font-smoothing: antialiased;
}
/* === Reset & Base END === */

/* === Login Screen START === */
.login-screen {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.login-screen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.login-card {
    text-align: center;
    padding: 48px 40px;
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.4);
    max-width: 400px;
    width: 90%;
    animation: fadeInUp 0.8s ease;
}

.login-logo {
    font-size: 56px;
    color: var(--note-yellow);
    margin-bottom: 16px;
    filter: drop-shadow(0 4px 12px rgba(255, 241, 118, 0.3));
}

.login-title {
    font-family: var(--font-handwriting);
    font-size: 48px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.login-subtitle {
    color: rgba(255, 255, 255, 0.6);
    font-size: 15px;
    margin-bottom: 32px;
    line-height: 1.5;
}

.btn-google-login {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 14px 32px;
    border: none;
    border-radius: 12px;
    background: #fff;
    color: #333;
    font-size: 15px;
    font-weight: 600;
    font-family: var(--font-ui);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.btn-google-login:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

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

.login-footer {
    margin-top: 24px;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.35);
}
/* === Login Screen END === */

/* === App Shell START === */
.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    transition: opacity 0.5s ease;
}

.app.hidden {
    opacity: 0;
    pointer-events: none;
    position: fixed;
    inset: 0;
}
/* === App Shell END === */

/* === Toolbar START === */
.toolbar {
    height: var(--toolbar-height);
    background: var(--toolbar-bg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
    z-index: 100;
    flex-shrink: 0;
}

.toolbar-left {
    display: flex;
    align-items: center;
}

.toolbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-handwriting);
    font-size: 24px;
    font-weight: 700;
    color: var(--note-yellow);
}

.toolbar-brand i {
    font-size: 22px;
}

.toolbar-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.note-count {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    font-weight: 500;
    padding: 4px 10px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.08);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 8px;
}

.user-avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.user-name {
    font-size: 13px;
    color: var(--toolbar-text);
    font-weight: 500;
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.btn-logout {
    padding: 8px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    font-size: 16px;
    transition: all 0.2s ease;
}

.btn-logout:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
}

/* 工具列功能按鈕 */
.btn-toolbar {
    padding: 6px 12px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.06);
    color: rgba(255, 255, 255, 0.55);
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-toolbar:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.3);
}

.btn-toolbar.hidden {
    display: none;
}
/* === Toolbar END === */

/* === Whiteboard START === */
.whiteboard {
    flex: 1;
    position: relative;
    overflow: hidden;

    /* 擬真白板材質 */
    background-color: var(--board-bg);
    background-image:
        /* 細微噪點紋理 */
        url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E"),
        /* 細格線 */
        linear-gradient(rgba(0,0,0,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,0,0,0.03) 1px, transparent 1px);
    background-size: 256px 256px, 40px 40px, 40px 40px;

    /* 白板凹陷效果 */
    box-shadow:
        inset 0 2px 8px rgba(0, 0, 0, 0.12),
        inset 0 0 0 3px var(--board-border);
}

/* 白板金屬框 */
.whiteboard::before {
    content: '';
    position: absolute;
    inset: 0;
    border: 4px solid var(--board-frame);
    border-radius: 2px;
    pointer-events: none;
    z-index: 50;
    box-shadow:
        inset 0 0 0 1px rgba(255,255,255,0.15),
        0 0 0 1px rgba(0,0,0,0.2);
}
/* === Whiteboard END === */

/* === Empty Hint START === */
.empty-hint {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: rgba(0, 0, 0, 0.2);
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.empty-hint.hidden {
    opacity: 0;
}

.empty-hint i {
    font-size: 72px;
    margin-bottom: 16px;
    display: block;
}

.empty-hint p {
    font-size: 18px;
    font-family: var(--font-ui);
    font-weight: 500;
    line-height: 1.6;
}
/* === Empty Hint END === */

/* === Sticky Note START === */
.sticky-note {
    position: absolute;
    min-width: var(--note-min-w);
    min-height: var(--note-min-h);
    max-width: var(--note-max-w);
    padding: 16px 16px 28px 16px;
    border-radius: 2px;
    cursor: grab;
    user-select: none;
    touch-action: none;
    transition:
        box-shadow 0.3s ease,
        transform 0.3s ease;

    /* 貼紙陰影 */
    box-shadow:
        3px 4px 10px rgba(0, 0, 0, 0.25),
        1px 2px 4px rgba(0, 0, 0, 0.15),
        0 0 2px rgba(0, 0, 0, 0.08);

    /* 紙質紋理 */
    background-image:
        linear-gradient(135deg, rgba(255,255,255,0.1) 0%, transparent 50%),
        url("data:image/svg+xml,%3Csvg viewBox='0 0 64 64' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='1.5' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
}

/* 貼紙頂部膠帶效果 */
.sticky-note::before {
    content: '';
    position: absolute;
    top: -6px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 14px;
    background: rgba(255, 255, 255, 0.45);
    border-radius: 1px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.08);
    z-index: 1;
}

/* 右下角捲起效果 */
.sticky-note::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 28px;
    height: 28px;
    background: linear-gradient(
        315deg,
        rgba(0, 0, 0, 0.08) 0%,
        rgba(0, 0, 0, 0.03) 35%,
        rgba(255, 255, 255, 0.3) 45%,
        transparent 60%
    );
    border-radius: 0 0 0 0;
    cursor: pointer;
    z-index: 2;
    transition: width 0.2s ease, height 0.2s ease;
}

/* 捲角 hover 放大 */
.sticky-note:not(.dragging)::after:hover {
    width: 36px;
    height: 36px;
}

/* 拖曳中狀態 */
.sticky-note.dragging {
    cursor: grabbing;
    box-shadow:
        8px 12px 28px rgba(0, 0, 0, 0.25),
        0 4px 10px rgba(0, 0, 0, 0.15);
    transform: scale(1.04) rotate(0deg) !important;
    z-index: 9999 !important;
    transition: box-shadow 0.2s ease;
}

/* 貼紙內容區 */
.note-content {
    font-family: var(--font-handwriting);
    font-size: 20px;
    line-height: 1.5;
    color: rgba(0, 0, 0, 0.78);
    word-wrap: break-word;
    overflow-wrap: break-word;
    outline: none;
    min-height: 40px;
    overflow-y: auto;

    /* 隱藏捲軸但保留捲動能力 */
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE/Edge */
}

/* Webkit 隱藏捲軸 */
.note-content::-webkit-scrollbar {
    display: none;
}

.note-content:empty::before {
    content: '點兩下開始寫...';
    color: rgba(0, 0, 0, 0.25);
    font-style: italic;
}

/* URL 型貼紙 */
.note-content a {
    color: #1565C0;
    text-decoration: underline;
    text-decoration-style: dotted;
    word-break: break-all;
    cursor: pointer;
}

.note-content a:hover {
    color: #0D47A1;
}

/* 圖片型貼紙 */
.note-content img {
    max-width: 100%;
    border-radius: 4px;
    display: block;
    margin: 4px 0;
}

/* 設定按鈕（捲角區域的觸發器） */
.note-settings-trigger {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    cursor: pointer;
    color: rgba(0, 0, 0, 0.15);
    font-size: 11px;
    z-index: 3;
    transition: color 0.2s ease;
}

.note-settings-trigger:hover {
    color: rgba(0, 0, 0, 0.5);
}

/* 時間戳 */
.note-timestamp {
    position: absolute;
    bottom: 4px;
    left: 12px;
    font-size: 10px;
    font-family: var(--font-ui);
    color: rgba(0, 0, 0, 0.2);
    pointer-events: none;
}
/* === Sticky Note END === */

/* === FAB Button START === */
.fab-add {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: var(--fab-size);
    height: var(--fab-size);
    border: none;
    border-radius: 16px;
    background: linear-gradient(135deg, #4A90D9 0%, #357ABD 100%);
    color: #fff;
    font-size: 24px;
    cursor: pointer;
    box-shadow:
        0 6px 20px rgba(74, 144, 217, 0.4),
        0 2px 6px rgba(0, 0, 0, 0.15);
    z-index: 200;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.fab-add:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow:
        0 10px 30px rgba(74, 144, 217, 0.5),
        0 4px 10px rgba(0, 0, 0, 0.2);
}

.fab-add:active {
    transform: translateY(0) scale(0.97);
}

.fab-add.disabled {
    background: #999;
    cursor: not-allowed;
    box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}
/* === FAB Button END === */

/* === Note Settings Panel START === */
.note-settings {
    position: fixed;
    bottom: 0;
    right: 0;
    width: 300px;
    background: #fff;
    border-radius: 16px 0 0 0;
    box-shadow: -4px -4px 24px rgba(0, 0, 0, 0.15);
    z-index: 500;
    transform: translateY(100%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.note-settings.visible {
    transform: translateY(0);
}

.note-settings.hidden {
    transform: translateY(100%);
}

.settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid #eee;
}

.settings-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: #333;
}

.btn-icon {
    padding: 6px;
    border: none;
    border-radius: 8px;
    background: transparent;
    color: #999;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-icon:hover {
    background: #f0f0f0;
    color: #333;
}

.settings-body {
    padding: 20px;
}

.settings-section {
    margin-bottom: 20px;
}

.settings-section:last-child {
    margin-bottom: 0;
}

.settings-section label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: #666;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 顏色選擇器 */
.color-picker {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.color-swatch {
    width: 36px;
    height: 36px;
    border: 3px solid transparent;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.color-swatch:hover {
    transform: scale(1.12);
}

.color-swatch.active {
    border-color: #333;
    box-shadow: 0 0 0 2px #fff, 0 0 0 4px #333;
}

/* 上傳按鈕 */
.btn-upload {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border: 2px dashed #ccc;
    border-radius: 10px;
    background: #fafafa;
    color: #666;
    font-size: 14px;
    font-family: var(--font-ui);
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
}

.btn-upload:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: #f0f6ff;
}

/* 刪除按鈕 */
.btn-delete {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border: none;
    border-radius: 10px;
    background: #fff0f0;
    color: var(--danger);
    font-size: 14px;
    font-family: var(--font-ui);
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
    font-weight: 500;
}

.btn-delete:hover {
    background: #ffe0e0;
}

/* 遮罩 */
.settings-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 499;
    opacity: 0;
    transition: opacity 0.35s ease;
    pointer-events: none;
}

.settings-overlay.visible {
    opacity: 1;
    pointer-events: auto;
}
/* === Note Settings Panel END === */

/* === Loading Spinner START === */
.spinner-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.4);
    z-index: 9999;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
/* === Loading Spinner END === */

/* === Toast Notification START === */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(80px);
    padding: 12px 24px;
    border-radius: 12px;
    background: #333;
    color: #fff;
    font-size: 14px;
    font-family: var(--font-ui);
    font-weight: 500;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
    z-index: 10000;
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast.error {
    background: var(--danger);
}

.toast.success {
    background: #2e7d32;
}
/* === Toast Notification END === */

/* === Responsive START === */
@media (max-width: 600px) {
    .toolbar-brand span {
        display: none;
    }
    .user-name {
        display: none;
    }
    .note-count {
        font-size: 11px;
    }
    .sticky-note {
        min-width: 130px;
        min-height: 110px;
        max-width: 240px;
    }
    .note-content {
        font-size: 17px;
    }
    .fab-add {
        bottom: 20px;
        right: 20px;
        width: 48px;
        height: 48px;
        font-size: 20px;
        border-radius: 14px;
    }
    .note-settings {
        width: 100%;
        border-radius: 16px 16px 0 0;
    }
}
/* === Responsive END === */