/* ================================
   Deep Sea ToDo – Final CSS
   Designed by 拓
================================ */

/* ---------- Root Variables ---------- */
:root {
    --deep-top: #004a7c;
    --deep-mid: #00345a;
    --deep-bottom: #001a33;

    --deep-glow: rgba(0, 180, 255, 0.08);

    --bubble-color: rgba(255, 255, 255, 0.12);

    --core-light-1: #00eaff;
    --core-light-2: #4dd0ff;
    --core-light-3: #0072ff;

    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-blur: 12px;

    --text-main: #e8f7ff;
    --text-dim: #b5c9d6;

    --shadow-core: 0 0 40px rgba(0, 150, 255, 0.25);
    --shadow-hover: 0 0 12px rgba(0, 200, 255, 0.6);

    --speed-fast: 0.2s;
    --speed-normal: 0.3s;

    --radius-s: 10px;
    --radius-m: 12px;
    --radius-l: 20px;
}

/* ---------- Background Layers ---------- */
body {
    position: relative;
    background:
        linear-gradient(to bottom, var(--deep-top), var(--deep-mid) 40%, var(--deep-bottom)),
        radial-gradient(circle at 50% -20%, var(--deep-glow), transparent 40%);
    margin: 0;
    padding: 0;
    font-family: "Noto Sans JP", sans-serif;
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
}

body::before,
body::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    animation-timing-function: ease-in-out;
}

body::before {
    background:
        radial-gradient(circle at 20% 30%, rgba(255,255,255,0.20) 0%, transparent 10%),
        radial-gradient(circle at 80% 50%, rgba(255,255,255,0.18) 0%, transparent 12%);
    animation: bubbleFloat1 22s infinite ease-in-out;
    animation-delay: -2s;
}

body::after {
    background:
        radial-gradient(circle at 40% 60%, rgba(255,255,255,0.16) 0%, transparent 9%),
        radial-gradient(circle at 70% 20%, rgba(255,255,255,0.14) 0%, transparent 11%);
    animation: bubbleFloat2 26s infinite ease-in-out;
    animation-delay: -9s;
}

/* Additional bubble layers */
.bubble-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 1;
}

.layer3 {
    background:
        radial-gradient(circle at 25% 85%, rgba(255,255,255,0.20) 0%, transparent 10%),
        radial-gradient(circle at 70% 15%, rgba(255,255,255,0.18) 0%, transparent 12%);
    animation: bubbleFloat3 20s infinite ease-in-out;
    animation-delay: -5s;
}

.layer4 {
    background:
        radial-gradient(circle at 10% 40%, rgba(255,255,255,0.22) 0%, transparent 9%),
        radial-gradient(circle at 90% 70%, rgba(255,255,255,0.17) 0%, transparent 11%);
    animation: bubbleFloat4 28s infinite ease-in-out;
    animation-delay: -12s;
}

.layer5 {
    background:
        radial-gradient(circle at 50% 90%, rgba(255,255,255,0.25) 0%, transparent 8%),
        radial-gradient(circle at 20% 10%, rgba(255,255,255,0.20) 0%, transparent 10%);
    animation: bubbleFloat5 18s infinite ease-in-out;
    animation-delay: -7s;
}

.layer6 {
    background:
        radial-gradient(circle at 70% 85%, rgba(255,255,255,0.24) 0%, transparent 8%),
        radial-gradient(circle at 30% 15%, rgba(255,255,255,0.18) 0%, transparent 10%);
    animation: bubbleFloat6 24s infinite ease-in-out;
    animation-delay: -15s;
}

/* ---------- Keyframes ---------- */
@keyframes bubbleFloat1 { 0% { transform: translateY(60px); opacity: 0; } 5% { opacity: 1; } 85% { opacity: 1; } 100% { transform: translateY(-180px); opacity: 0; } }
@keyframes bubbleFloat2 { 0% { transform: translateY(70px); opacity: 0; } 5% { opacity: 1; } 85% { opacity: 1; } 100% { transform: translateY(-190px); opacity: 0; } }
@keyframes bubbleFloat3 { 0% { transform: translateY(65px); opacity: 0; } 5% { opacity: 1; } 85% { opacity: 1; } 100% { transform: translateY(-170px); opacity: 0; } }
@keyframes bubbleFloat4 { 0% { transform: translateY(75px); opacity: 0; } 5% { opacity: 1; } 85% { opacity: 1; } 100% { transform: translateY(-200px); opacity: 0; } }
@keyframes bubbleFloat5 { 0% { transform: translateY(80px); opacity: 0; } 5% { opacity: 1; } 85% { opacity: 1; } 100% { transform: translateY(-180px); opacity: 0; } }
@keyframes bubbleFloat6 { 0% { transform: translateY(90px); opacity: 0; } 5% { opacity: 1; } 85% { opacity: 1; } 100% { transform: translateY(-210px); opacity: 0; } }

/* ---------- Layout ---------- */
main {
    flex: 1;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.todo-container {
    width: 90%;
    max-width: 480px;
    padding: 6px 12px;
    border-radius: var(--radius-l);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    box-shadow: var(--shadow-core);
    border: 1px solid var(--glass-border);
    position: relative;
    z-index: 2;
}

/* ---------- Title ---------- */
.title {
    text-align: center;
    font-size: 28px;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--core-light-2), var(--core-light-1), var(--core-light-2));
    -webkit-background-clip: text;
    color: transparent;
    letter-spacing: 2px;
}

/* ---------- Input Area ---------- */
.input-area {
    display: flex;
    gap: 10px;
    margin-bottom: 4px;
}

#todo-input {
    flex: 1;
    padding: 12px;
    border-radius: 10px;
    border: none;
    outline: none;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
    font-size: 16px;
}

#add-btn {
    padding: 12px 18px;
    border: none;
    border-radius: 10px;
    background: linear-gradient(135deg, #00c6ff, #0072ff);
    color: white;
    cursor: pointer;
    transition: var(--speed-fast);
}

#add-btn:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-hover);
}

/* ---------- Search ---------- */
.search-area {
    margin-bottom: 4px;
    position: relative;
    z-index: 3;
}

#search-input {
    width: 100%;
    padding: 10px 12px;
    border-radius: 10px;
    border: none;
    outline: none;
    background: rgba(255,255,255,0.12);
    color: var(--text-main);
    font-size: 16px;
    backdrop-filter: blur(6px);
    transition: var(--speed-normal);
}

#search-input:focus {
    background: rgba(255,255,255,0.18);
    box-shadow: 0 0 10px rgba(0,200,255,0.4);
}

/* ---------- Deep Sea Message ---------- */
.deepsea-message {
    margin: 2px 0 4px;
    padding: 4px 8px;
    font-size: 15px;
    color: #cfefff;
    background: rgba(255,255,255,0.08);
    border-left: 3px solid #4dd0ff;
    border-radius: 8px;
    backdrop-filter: blur(6px);
    animation: fadeIn 1.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Todo List ---------- */
.todo-list {
    list-style: none;
    padding: 0;
    margin-top: 0;
}

.todo-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(255, 255, 255, 0.05);
    padding: 8px 14px;
    border-radius: 8px;
    margin-bottom: 6px;
    transition: var(--speed-normal);
    border-left: 4px solid var(--core-light-1);
}

.todo-item.light { background: rgba(255,255,255,0.10); border-left-color: #4dd0ff; }
.todo-item.middle { background: rgba(255,255,255,0.08); border-left-color: #00aaff; }
.todo-item.deep { background: rgba(255,255,255,0.06); border-left-color: #005f99; }

.todo-item:hover {
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 0 12px rgba(0, 200, 255, 0.3);
    transform: translateY(-2px);
}

.todo-item.completed {
    opacity: 0.6;
    text-decoration: line-through;
    border-left-color: #4dd0ff;
    animation: sinkFade 0.6s ease forwards;
}

@keyframes sinkFade {
    0% { transform: translateY(0); opacity: 1; filter: blur(0); }
    40% { transform: translateY(6px); opacity: 0.7; filter: blur(1px); }
    100% { transform: translateY(14px); opacity: 0; filter: blur(3px); }
}

.todo-item.dragging {
    opacity: 0.3;
    transform: scale(0.98);
}

/* ---------- Buttons ---------- */
.edit-btn,
.delete-btn {
    background: none;
    border: none;
    cursor: pointer;
    transition: var(--speed-fast);
    font-size: 18px;
}

.edit-btn {
    color: #4dd0ff;
    margin-right: 8px;
}

.edit-btn:hover {
    transform: scale(1.2);
    color: #00eaff;
}

.delete-btn {
    color: #ff6b6b;
}

.delete-btn:hover {
    transform: scale(1.2);
}

/* ---------- Edit Input ---------- */
.edit-input {
    width: 100%;
    padding: 8px;
    border-radius: 8px;
    border: none;
    outline: none;
    background: rgba(255,255,255,0.15);
    box-shadow: 0 0 8px rgba(0, 200, 255, 0.3);
    color: var(--text-main);
    font-size: 16px;
}

/* ---------- Date Status ---------- */
.expired {
    background: rgba(0, 20, 40, 0.6);
    border-left: 3px solid #003355;
    color: #aac4d4;
    opacity: 0.8;
}

.today {
    background: rgba(80, 180, 255, 0.25);
    border-left: 3px solid #4dc3ff;
    color: #e8faff;
    box-shadow: 0 0 8px rgba(80, 180, 255, 0.4);
}

/* ---------- Help Modal ---------- */
.help-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    background: rgba(255,255,255,0.15);
    border: none;
    padding: 8px 12px;
    border-radius: 8px;
    color: var(--text-main);
    cursor: pointer;
    backdrop-filter: blur(6px);
    transition: var(--speed-normal);
}

.help-btn:hover {
    background: rgba(255,255,255,0.25);
}

.help-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(4px);
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.help-content {
    background: rgba(255,255,255,0.1);
    padding: 20px;
    border-radius: 12px;
    width: 90%;
    max-width: 400px;
    color: var(--text-main);
    animation: fadeIn 0.4s ease;
}

.close-help {
    margin-top: 15px;
    padding: 8px 12px;
    background: rgba(255,255,255,0.2);
    border: none;
    border-radius: 8px;
    color: var(--text-main);
    cursor: pointer;
}
/* ================================
   Responsive (スマホ最適化)
================================ */
@media (max-width: 480px) {

    /* 全体の余白調整 */
    body {
        padding: 12px 0;
        align-items: center;
    }

    .todo-container {
        width: 94%;
        padding: 10px 14px;
        border-radius: 16px;
    }

    /* タイトルを少し小さく */
    .title {
        font-size: 22px;
        letter-spacing: 1.5px;
        margin-bottom: 16px;
    }

    /* 入力エリアを縦並びに */
    .input-area {
        flex-direction: column;
        gap: 8px;
    }

    #todo-input,
    #todo-date,
    #todo-level,
    #todo-repeat {
        width: 100%;
        font-size: 15px;
        padding: 10px;
    }

    #add-btn {
        width: 100%;
        padding: 12px;
        font-size: 16px;
    }

    /* 検索バー */
    #search-input {
        font-size: 15px;
        padding: 10px;
    }

    /* タスクカードの密度調整 */
    .todo-item {
        padding: 10px 12px;
        font-size: 15px;
    }

    .edit-btn,
    .delete-btn {
        font-size: 20px;
    }

    /* DeepSeaメッセージ */
    .deepsea-message {
        font-size: 14px;
        padding: 6px 10px;
    }

    /* モーダルの最適化 */
    .help-content {
        width: 92%;
        padding: 16px;
        font-size: 15px;
    }

    .close-help {
        width: 100%;
        padding: 10px;
        font-size: 15px;
    }

    /* フッターをスマホで見やすく */
    footer.footer {
        font-size: 13px;
        padding: 10px 0;
    }
}