:root {
    --bg-primary: #f9f9f9;
    --bg-card: #ffffff;
    --bg-button: #fff;
    --bg-button-hover: #d0e7ff;
    --bg-button-link: #76ff80;
    --bg-button-back: #fbe3e3;
    --bg-button-home: #e8e8e8;
    --bg-schoolend: #fff7cc;
    --bg-exam-card: #fff;
    --bg-exam-expired: #f5f5f5;
    --bg-danger-alert: rgba(255, 0, 0, 0.62);
    --bg-current-lesson: #66ffad;

    --text-primary: #000000;
    --text-secondary: #666666;
    --text-countdown: #004085;
    --text-stunde-target: #0b5394;
    --text-schoolend: #b08d00;
    --text-exam-main: #b08d00;
    --text-danger-alert: #000000;
    --text-back-button: #a00;
    --text-current-lesson: #000000;

    --border-primary: #aaa;
    --border-button: #aaa;
    --border-card: #ccc;
    --border-back-button: #e3a1a1;
    --border-schoolend: #ffe599;
    --border-danger-alert: #aa0000;
    --border-current-lesson: #59dd97;

    --shadow-primary: rgba(0, 0, 0, 0.5);
    --shadow-current-lesson: #66ffad;

    --color-success: #4CAF50;
    --color-success-hover: #45a049;
    --color-warning: #ff9800;
    --color-error: #d32f2f;
    --color-info: #1976d2;
    --bg-success: #d4edda;
    --text-success: #155724;
    --border-success: #c3e6cb;
    --bg-error: #f8d7da;
    --text-error: #721c24;
    --border-error: #f5c6cb;
    --bg-info: #d1ecf1;
    --text-info: #0c5460;
    --border-info: #bee5eb;
    --bg-warning: rgba(255, 152, 0, 0.1);
    --bg-highlight: rgba(255, 235, 59, 0.5);
}

[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-card: #2a2a2a;
    --bg-button: #3a3a3a;
    --bg-button-hover: #4a5a6a;
    --bg-button-link: #4d994d;
    --bg-button-back: #4a3030;
    --bg-button-home: #3a3a3a;
    --bg-schoolend: #4a4520;
    --bg-exam-card: #2a2a2a;
    --bg-exam-expired: #252525;
    --bg-danger-alert: rgba(150, 0, 0, 0.62);
    --bg-current-lesson: #2d6645;

    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --text-countdown: #6bb6ff;
    --text-stunde-target: #7eb8e8;
    --text-schoolend: #d4b700;
    --text-exam-main: #d4b700;
    --text-danger-alert: #ffffff;
    --text-back-button: #ff6666;
    --text-current-lesson: #ffffff;

    --border-primary: #555;
    --border-button: #555;
    --border-card: #444;
    --border-back-button: #663333;
    --border-schoolend: #8a7520;
    --border-danger-alert: #992222;
    --border-current-lesson: #3a6650;

    --shadow-primary: rgba(0, 0, 0, 0.8);
    --shadow-current-lesson: #2d6645;

    --color-success: #66bb6a;
    --color-success-hover: #5cb85c;
    --color-warning: #ffa726;
    --color-error: #ef5350;
    --color-info: #42a5f5;
    --bg-success: #1b4d1b;
    --text-success: #a8e6a8;
    --border-success: #2d6b2d;
    --bg-error: #4d1a1a;
    --text-error: #ffb3b3;
    --border-error: #6b2d2d;
    --bg-info: #1a3d4d;
    --text-info: #a8d8e6;
    --border-info: #2d5b6b;
    --bg-warning: rgba(255, 167, 38, 0.15);
    --bg-highlight: rgba(255, 235, 59, 0.3);
}

body {
    font-family: Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 100vh;
    margin: 0;
    transition: background-color 0.3s ease, color 0.3s ease;
}
main{
    margin-left: 15em;
    margin-right: 15em;
    margin-bottom: 2em;
}
.card{
    padding: 2em;
    background: var(--bg-card);
    box-shadow: 4px 4px 10px var(--shadow-primary);
    border-radius: 2em;
    margin-bottom: 2em;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}
h1 {
    margin-top: 40px;
}
.button-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 30px 0;
}
button {
    padding: 15px 25px;
    font-size: 1.3rem;
    border-radius: 2em;
    border: 1px solid var(--border-button);
    background: var(--bg-button);
    color: var(--text-primary);
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}
button:hover {
    background: var(--bg-button-hover);
}
.countdown {
    font-size: 2.5rem;
    margin-top: 0.5em;
    margin-bottom: 0.5em;
    color: var(--text-countdown);
}

.stunde-target, #stunde-target {
    margin-top: 6px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-stunde-target);
}
.back-btn {
    margin-top: 30px;
    background: var(--bg-button-back);
    color: var(--text-back-button);
    border: 1px solid var(--border-back-button);
}
button.current-lesson {
    background: var(--bg-current-lesson) !important;
    border-color: var(--border-current-lesson) !important;
    color: var(--text-current-lesson) !important;
    box-shadow: 0 0 8px var(--shadow-current-lesson);
}
.schoolend-container {
    box-shadow: 4px 4px 10px var(--shadow-primary);
    margin-top: 25px;
    margin-bottom: 10px;
    padding: 16px 25px;
    background: var(--bg-schoolend);
    border: 1.5px solid var(--border-schoolend);
    border-radius: 1em;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}
.schoolend-title {
    font-size: 1.25rem;
    font-weight: bold;
    margin-bottom: 7px;
    color: var(--text-schoolend);
}
.schoolend-countdown {
    font-size: 1.6rem;
    color: var(--text-schoolend);
    font-family: "Consolas", "Fira Mono", monospace;
    letter-spacing: 1.5px;
}

.top-nav {
    position: fixed;
    top: 15px;
    left: 15px;
    right: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    gap: 10px;
}

.nav-btn {
    padding: 10px 15px;
    font-size: 1.1rem;
    border: 1px solid var(--border-button);
    background: var(--bg-button-home);
    cursor: pointer;
    transition: background 0.2s;
    border-radius: 2em;
}

.nav-btn:hover {
    background: var(--bg-button-hover);
}

.theme-toggle-btn {
    padding: 10px;
    width: 50px;
    height: 50px;
    min-width: 50px;
    min-height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    aspect-ratio: 1 / 1;
    transition: background 0.2s, transform 0.2s;
}

.theme-toggle-btn:hover {
    transform: scale(1.1);
}

.theme-toggle-btn .material-icons {
    font-size: 28px;
    line-height: 1;
}

.text-bold {
    font-weight: bold;
}

.link-btn {
    background-color: var(--bg-button-link);
}

.exam-card {
    padding: 12px 16px;
    border: 1px solid var(--border-card);
    border-radius: 12px;
    background: var(--bg-exam-card);
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    align-items: start;
    gap: 12px;
    width: 100%;
    box-sizing: border-box;
    margin-bottom: 12px;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}
.exam-card > .exam-title {
    grid-column: 1 / 2;
    align-self: start;
    font-weight: 800;
    margin-bottom: 6px;
}
.exam-card > .exam-main-block {
    grid-column: 2 / 3;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.exam-card > .exam-nach-block {
    grid-column: 3 / 4;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.exam-countdown {
    font-family: Consolas, "Fira Mono", monospace;
}
.exam-countdown-main {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-exam-main);
}
.exam-countdown-nach {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
}
.hidden {
    display: none;
}

.exam-expired {
    opacity: 0.65;
    filter: grayscale(40%);
    background: var(--bg-exam-expired);
}

.exam-main-completed {
    background-color: var(--bg-success);
}

.danger-alert{
    background-color: var(--bg-danger-alert);
    border-style: solid;
    border-color: var(--border-danger-alert);
    border-radius: 1em;
    padding: 1em;
    color: var(--text-danger-alert);
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

@media (max-width: 700px) {
    .exam-card {
        display: grid;
        grid-template-columns: 1fr;
        grid-auto-rows: auto;
        align-items: start;
        gap: 10px;
    }
    .exam-card > .exam-title {
        grid-column: 1 / -1;
        font-size: 1.2rem;
    }
    .exam-card > .exam-main-block {
        grid-column: 1 / -1;
    }
    .exam-card > .exam-nach-block {
        grid-column: 1 / -1;
    }
    .exam-countdown-main {
        font-size: 1.8rem;
    }
    .exam-countdown-nach {
        font-size: 1.4rem;
    }
}
@media (max-width: 1500px) {
    main{
        margin-left: 10em;
        margin-right: 10em;
    }
}
@media (max-width: 1000px) {
    body {
        font-size: 1rem;
        padding: 1em;
    }
    main {
        margin-left: 0.5em;
        margin-right: 0.5em;
        padding: 1em;
        box-shadow: none;
        border-radius: 2em;
    }
    h1 {
        font-size: 1.5em;
        margin-top: 60px;
    }
    h2 {
        font-size: 1.1em;
    }
    .button-grid {
        gap: 15px;
    }
    button, .button-grid button {
        width: 100%;
        min-height: 3.5em;
        font-size: 1.2em;
        box-sizing: border-box;
    }
    .countdown {
        font-size: 2em;
    }

    .stunde-target, #stunde-target {
        font-size: 1.6rem;
    }
    .schoolend-title, .schoolend-countdown {
        font-size: 1em;
    }
    .back-btn {
        font-size: 1em;
        padding: 10px 0;
        width: 100%;
        box-sizing: border-box;
    }

    .top-nav {
        top: 10px;
        left: 10px;
        right: 10px;
        gap: 10px;
    }

    .nav-btn {
        font-size: 1em;
        padding: 10px;
        height: 45px;
        box-sizing: border-box;
        border-radius: 2em;
        display: flex;
        align-items: center;
        justify-content: center;
        flex: 1;
    }

    .theme-toggle-btn {
        width: auto;
        min-width: auto;
        min-height: auto;
        border-radius: 2em;
        aspect-ratio: auto;
        flex: 1;
    }

    .theme-toggle-btn .material-icons {
        font-size: 24px;
        line-height: 1;
    }
}
svg{
    padding: 0;
    margin: 0;
    width: 1.5em;
    height: 1.5em;
}
button#pip-btn{
    display: flex;
    flex-direction: column;
    margin-top: 0.2em;
}