@import url("/static/css/base.css");

:root {
    --marked-color: #10B981;
    --primary-color: #10B981;
    --primary-hover: #059669;
    --secondary-color: #f9fafb;
    --accent-color: #f59e0b;
    --text-color: #1f2937;
    --heading-color: #111827;
    --border-color: #d1d5db;
    --card-bg: #ffffff;
    --shadow-light: rgba(0, 0, 0, 0.05);
    --shadow-medium: rgba(0, 0, 0, 0.1);
    --font-primary: 'Inter', 'LXGW WenKai GB', sans-serif;
    --font-body: 'Inter', 'LXGW WenKai GB', sans-serif;
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px
}

html {
    box-sizing: border-box;
    /* Default smooth scroll can amplify visual jumps during virtualization on mobile. */
    scroll-behavior: smooth;
    overflow: auto
}

*,
:after,
:before {
    box-sizing: inherit
}

body {
    font-family: var(--font-body);
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--secondary-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-primary);
    color: var(--heading-color);
    margin-bottom: .6em;
    line-height: 1.3;
    font-weight: 600
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color .2s ease
}

.main-content {
    flex-grow: 1;
    padding: 2.5rem 1.5rem
}

@media (max-width:768px) {
    .main-content {
        padding: 2rem 1rem
    }
}

.words-container {
    margin: 2rem auto;
    padding: 2rem;
    margin-left: 5rem;
    margin-right: 5rem;
    background-color: var(--card-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 10px 30px -10px var(--shadow-medium)
}

.words-header {
    text-align: center;
    margin-bottom: 2.5rem
}

.words-header h1 {
    font-size: 2.5rem;
    color: var(--heading-color);
    margin-bottom: .5rem
}

.words-header p {
    font-size: 1.1rem;
    color: var(--text-color);
    margin-bottom: 1.5rem
}

.search-filter-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    margin: 2rem 0;
    flex-wrap: wrap
}

.search-box {
    position: relative;
    min-width: 300px;
    margin-bottom: 10px;
}

.search-box input {
    width: 100%;
    padding: .75rem 1rem .75rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    background-color: var(--card-bg);
    transition: border-color .3s ease
}

.search-box input:focus {
    outline: 0;
    border-color: var(--primary-color)
}

.search-icon {
    position: absolute;
    left: .75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-color);
    opacity: .5
}

.filter-controls {
    display: flex;
    align-items: center;
    gap: .5rem;
    margin-bottom: 10px;
}

.filter-controls label {
    font-weight: 500;
    color: var(--heading-color);
    white-space: nowrap
}

.filter-controls select {
    padding: .75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    background-color: var(--card-bg);
    transition: border-color .3s ease;
    min-width: 120px
}

.filter-controls select:focus {
    outline: 0;
    border-color: var(--primary-color)
}

.word-tooltip {
    position: absolute;
    z-index: 1000;
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: 0 4px 20px var(--shadow-medium);
    padding: .75rem;
    max-width: 300px;
    display: none;
    pointer-events: none;
    font-weight: 500;
}

.tooltip-content {
    font-size: .9rem;
    line-height: 1.5;
    color: var(--text-color)
}

.tooltip-content div {
    margin-bottom: .5rem
}

.tooltip-content div:last-child {
    margin-bottom: 0
}

.data-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap
}

.action-btn {
    padding: .7rem 1.2rem;
    font-size: .95rem;
    font-weight: 600;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    color: var(--text-color);
    cursor: pointer;
    transition: all .2s ease;
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    min-width: 140px;
    justify-content: center
}

.action-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px var(--shadow-light)
}

.action-btn .fas {
    font-size: 1rem
}

.word-card-container {
    position: relative
}

.learn-toggle-btn {
    position: absolute;
    top: 5px;
    right: 5px;
    background-color: #e5e7eb;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: .9rem;
    transition: background-color .2s, color .2s, border-color .2s;
    z-index: 2
}

.learn-toggle-btn:hover {
    background-color: #cff4d8;
    border-color: var(--marked-color)
}

.word-card.learned .learn-toggle-btn:hover {
    background-color: #fed7d7;
    border-color: #e53e3e;
    color: #c53030
}

.learn-toggle-btn .icon-times {
    display: none
}

.learn-toggle-btn .icon-check {
    display: inline-block
}

.word-card.learned .learn-toggle-btn:hover .icon-check {
    display: none
}

.word-card.learned .learn-toggle-btn:hover .icon-times {
    display: inline-block
}

.word-card.learned .learn-toggle-btn {
    background-color: #059669;
    /* darker tint using color-mix (modern browsers) */
    background-color: color-mix(in srgb, var(--marked-color) 85%, black 15%);
    color: #fff;
    opacity: 1;
    visibility: visible
}

.word-card.learned {
    background-color: #f1f0fd;
    border-color: var(--primary-color)
}

.words-grid {
    display: block;
    position: relative;
    padding: .5rem;
    min-height: 200px;
    /* Prevent UA scroll anchoring from fighting our manual virtualization offsets */
    overflow-anchor: none;
}

.word-card {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.5rem 1rem;
    background-color: var(--secondary-color);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
    text-decoration: none;
    transition: box-shadow .2s ease, border-color .2s ease, transform .2s ease;
    min-height: 120px;
    -webkit-tap-highlight-color: transparent;
}

/* The virtualized inner container shifts with transform; hint the browser this is intentional */
.scroll-container {
    will-change: transform;
}

/* On the words page only, disable smooth scroll to reduce perceived position jumps on mobile */
html.words-page {
    scroll-behavior: auto;
}

.word-card:hover {
    box-shadow: 0 8px 20px -5px var(--shadow-medium);
    border-color: var(--primary-color);
    transform: translateY(-2px)
}

.word-text {
    font-size: 2rem;
    font-weight: 400;
    color: var(--heading-color);
    margin-bottom: .5rem;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    line-height: 1.2;
    width: 100%;
    display: block
}

.word-pinyin {
    font-size: .9rem;
    color: var(--text-color);
    text-align: center;
    white-space: nowrap;
    transition: all .2s ease;
    margin-bottom: -5px
}

.word-level {
    position: absolute;
    bottom: 4px;
    right: 4px;
    font-size: .75rem;
    color: #6b7280;
    background-color: rgba(107, 114, 128, .1);
    padding: .2rem .5rem;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    line-height: 1;
    font-family: Georgia, serif;
    letter-spacing: .5px;
    border: 1px solid rgba(107, 114, 128, .2);
    z-index: 1;
    transition: all .2s ease
}

[data-level="1"] .word-level {
    color: #16a34a;
    background-color: rgba(22, 163, 74, .1);
    border-color: rgba(22, 163, 74, .2)
}

[data-level="2"] .word-level {
    color: #65a30d;
    background-color: rgba(101, 163, 13, .1);
    border-color: rgba(101, 163, 13, .2)
}

[data-level="3"] .word-level {
    color: #ca8a04;
    background-color: rgba(202, 138, 4, .1);
    border-color: rgba(202, 138, 4, .2)
}

[data-level="4"] .word-level {
    color: #ea580c;
    background-color: rgba(234, 88, 12, .1);
    border-color: rgba(234, 88, 12, .2)
}

[data-level="5"] .word-level {
    color: #dc2626;
    background-color: rgba(220, 38, 38, .1);
    border-color: rgba(220, 38, 38, .2)
}

[data-level="6"] .word-level {
    color: #b91c1c;
    background-color: rgba(185, 28, 28, .1);
    border-color: rgba(185, 28, 28, .2)
}

[data-level="7"] .word-level {
    color: #991b1b;
    background-color: rgba(153, 27, 27, .1);
    border-color: rgba(153, 27, 27, .2)
}

@media (max-width:1200px) {
    .words-container {
        margin-left: 3rem;
        margin-right: 3rem
    }

    .words-grid {
        grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
        gap: 1.25rem
    }
}

@media (max-width:992px) {
    .words-container {
        margin: 1.5rem auto;
        margin-left: 2rem;
        margin-right: 2rem;
        padding: 1.5rem
    }

    .words-header h1 {
        font-size: 2.2rem
    }

    .words-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 1rem
    }

    .word-text {
        font-size: 1.8rem
    }

    .word-card {
        padding: 1.25rem .75rem;
        min-height: 110px
    }
}

@media (max-width:768px) {
    .words-container {
        margin: 1rem auto;
        margin-left: 1rem;
        margin-right: 1rem;
        padding: 1.25rem;
        border-radius: var(--border-radius-md)
    }

    .words-header {
        margin-bottom: 2rem
    }

    .words-header h1 {
        font-size: 2rem
    }

    .words-header p {
        font-size: 1rem;
        margin-bottom: 1.25rem
    }

    .search-filter-container {
        flex-direction: column;
        gap: 1.5rem;
        margin: 1.5rem 0
    }

    .search-box {
        min-width: 250px
    }

    .data-actions {
        gap: .75rem;
        margin-bottom: 1.5rem
    }

    .action-btn {
        padding: .6rem 1rem;
        font-size: .9rem;
        min-width: 120px
    }

    .words-grid {
        grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
        gap: .875rem
    }

    .word-card {
        padding: 1rem .5rem;
        min-height: 100px
    }

    .word-text {
        font-size: 1.6rem;
        margin-bottom: .375rem
    }

    .word-pinyin {
        font-size: .8rem;
        padding: .15rem .5rem
    }

    .learn-toggle-btn {
        width: 28px;
        height: 28px;
        font-size: .8rem
    }
}

@media (max-width:480px) {
    .scroll-container {
        grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)) !important;
    }

    .words-container {
        margin: .75rem auto;
        margin-left: .75rem;
        margin-right: .75rem;
        padding: 1rem;
        border-radius: var(--border-radius-md)
    }

    .words-header h1 {
        font-size: 1.8rem;
        margin-bottom: .375rem
    }

    .words-header p {
        font-size: .95rem;
        margin-bottom: 1rem;
        line-height: 1.5
    }

    .search-filter-container {
        gap: 1rem;
        margin: 1rem 0
    }

    .search-box {
        min-width: 200px
    }

    .search-box input {
        padding: .6rem .8rem .6rem 2rem;
        font-size: .9rem
    }

    .filter-controls select {
        padding: .6rem .8rem;
        font-size: .9rem;
        min-width: 100px
    }

    .data-actions {
        flex-direction: column;
        align-items: center;
        gap: .5rem;
        margin-bottom: 1.25rem
    }

    .action-btn {
        padding: .6rem 1.5rem;
        font-size: .9rem;
        width: 100%;
        max-width: 200px
    }

    .words-grid {
        grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
        gap: .75rem;
        padding: .25rem
    }

    .word-card {
        padding: .875rem .375rem;
        min-height: 90px
    }

    .word-text {
        font-size: 1.4rem;
        margin-bottom: .25rem
    }

    .word-pinyin {
        font-size: .75rem;
        padding: .125rem .375rem
    }

    .learn-toggle-btn {
        width: 26px;
        height: 26px;
        font-size: .75rem
    }
}

@media (max-width:360px) {
    .words-container {
        margin: .5rem auto;
        margin-left: .5rem;
        margin-right: .5rem;
        padding: .875rem
    }

    .words-header h1 {
        font-size: 1.6rem
    }

    .words-grid {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
        gap: .625rem
    }

    .word-card {
        padding: .75rem .25rem;
        min-height: 80px
    }

    .word-text {
        font-size: 1.25rem
    }

    .word-pinyin {
        font-size: .7rem
    }

    .learn-toggle-btn {
        width: 24px;
        height: 24px;
        top: 4px;
        right: 4px;
        font-size: .7rem
    }
}

@media (prefers-contrast:high) {
    .word-card {
        border-width: 2px
    }

    .action-btn {
        border-width: 2px
    }

    .learn-toggle-btn {
        border-width: 2px
    }
}

@media (prefers-reduced-motion:reduce) {

    .action-btn,
    .learn-toggle-btn,
    .word-card {
        transition: none
    }

    .word-card:hover {
        transform: none
    }

    .action-btn:hover {
        transform: none
    }
}

.grid-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-left: .5rem;
    padding-right: .5rem;
    flex-wrap: wrap;
}