:root {
    /* Temel renkler */
    --zemin: #f4f7fb;
    --panel: #ffffff;
    --panel-ikincil: #eef3f8;
    --metin: #172033;
    --soluk-metin: #637083;
    --cizgi: #d9e2ec;
    --lacivert: #12355b;
    --lacivert-acik: #1f5d8f;
    --vurgu: #2f80ed;
    --basari: #2c7a4b;
    --uyari: #a35d00;
    --golge: 0 18px 45px rgba(18, 53, 91, 0.12);
    --yaricap: 8px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    color: var(--metin);
    background: var(--zemin);
    overflow-x: hidden;
    transition: background 0.25s ease, color 0.25s ease;
}

button,
textarea {
    font: inherit;
}

button {
    cursor: pointer;
}

.sayfa-kapsayici {

    width: min(1440px, calc(100% - 32px));
    margin: 0 auto;
    padding: 20px 0 42px;
}

.ust-alan {

    position: relative;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    width: 100%;
    margin: 0 auto 16px;
    gap: 24px;
    padding: 22px 24px;
    overflow: hidden;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    background: #ffffff;
    box-shadow: 0 8px 22px rgba(15, 23, 42, 0.06);
    animation: heroBelir 0.45s ease both;
    transition: all 0.3s ease;
}

.hero-icerik {
    position: relative;
    z-index: 1;
    max-width: 860px;
}

.etiket {
    margin: 0 0 8px;
    color: #64748b;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h1 {
    max-width: 900px;
    margin-bottom: 10px;
    color: #0f172a;
    font-size: clamp(1.8rem, 3vw, 2.7rem);
    font-weight: 800;
    line-height: 1.08;
    letter-spacing: 0.01em;
}

h1 span {
    display: block;
}

.baslik-alt-satir {
    margin-top: 3px;
    color: #475569;
    font-weight: 500;
    letter-spacing: 0.025em;
}

h2 {
    margin-bottom: 8px;
    font-size: 1.25rem;
}

h3 {
    margin-bottom: 10px;
    font-size: 1rem;
}

.aciklama {
    max-width: 720px;
    margin-bottom: 0;
    color: #6b7280;
    font-size: 0.95rem;
    line-height: 1.55;
}

.birincil-buton,
.ikincil-buton,
.algoritma-secenegi {
    border: 0;
    border-radius: var(--yaricap);
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.birincil-buton:hover,
.ikincil-buton:hover,
.algoritma-secenegi:hover {
    transform: translateY(-2px);
}

.ana-yerlesim {

    display: grid;
    grid-template-columns: 280px minmax(0, 1fr) 320px;
    gap: 18px;
    margin-top: 22px;
    align-items: start;
    min-width: 0;
}

.yan-panel,
.giris-karti,
.gorsel-karti,
.adim-karti,
.sag-kart,
.karsilastirma-bolumu {
    border: 1px solid var(--cizgi);
    border-radius: var(--yaricap);
    background: var(--panel);
    box-shadow: var(--golge);
}

.yan-panel {

    align-self: start;
    position: sticky;
    top: 18px;
    padding: 20px;
}

.algoritma-listesi {
    display: grid;
    gap: 10px;
    margin-bottom: 18px;
}

.algoritma-secenegi {
    width: 100%;
    padding: 12px 14px;
    color: var(--metin);
    text-align: left;
    background: var(--panel-ikincil);
    border: 1px solid var(--cizgi);
}

.algoritma-secenegi.aktif {
    color: #ffffff;
    background: var(--lacivert);
    border-color: var(--lacivert);
    box-shadow: 0 10px 24px rgba(31, 93, 143, 0.22);
}

.bilgi-karti {
    padding: 16px;
    margin-top: 14px;
    border-radius: var(--yaricap);
    background: var(--panel-ikincil);
    border: 1px solid var(--cizgi);
}

.bilgi-karti p,
.bilgi-karti li {
    color: var(--soluk-metin);
    line-height: 1.55;
}

.bilgi-karti ul {
    padding-left: 18px;
    margin: 0;
}

.icerik-alani {
    display: grid;
    gap: 18px;
    min-width: 0;
}

.giris-karti,
.gorsel-karti,
.adim-karti,
.sag-kart,
.karsilastirma-bolumu {
    padding: 22px;
}

.sag-panel {
    position: sticky;
    top: 18px;
    display: grid;
    gap: 14px;
    min-width: 0;
}

.sag-kart {
    min-width: 0;
}

.sag-kart h2 {
    font-size: 1.05rem;
}

.sag-kart p {
    color: var(--soluk-metin);
    line-height: 1.5;
}

.kart-baslik-satiri {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: flex-start;
}

.kart-baslik-satiri p {
    margin-bottom: 0;
    color: var(--soluk-metin);
}

.islem-dugmeleri,
.ana-dugme-satiri {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

textarea {
    width: 100%;
    min-height: 170px;
    margin: 18px 0 10px;
    padding: 16px;
    color: var(--metin);
    resize: vertical;
    background: var(--panel-ikincil);
    border: 1px solid var(--cizgi);
    border-radius: var(--yaricap);
    outline: none;
    line-height: 1.6;
}

textarea:focus {
    border-color: var(--vurgu);
    box-shadow: 0 0 0 3px rgba(47, 128, 237, 0.16);
}

.birincil-buton,
.ikincil-buton {
    padding: 12px 16px;
    font-weight: 700;
}

.birincil-buton {
    color: #ffffff;
    background: var(--lacivert);
}

.ikincil-buton {
    color: var(--metin);
    background: var(--panel-ikincil);
    border: 1px solid var(--cizgi);
}

.uyari-alani {
    min-height: 24px;
    margin-bottom: 10px;
    color: var(--uyari);
    font-weight: 700;
}

.sonuc-izgara {

    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
}

.sonuc-karti {
    padding: 18px;
    border: 1px solid var(--cizgi);
    border-radius: var(--yaricap);
    background: var(--panel);
    box-shadow: var(--golge);
}

.sonuc-karti span,
.sonuc-karti small {
    display: block;
    color: var(--soluk-metin);
}

.sonuc-karti strong {
    display: block;
    margin: 8px 0 4px;
    color: var(--lacivert-acik);
    font-size: 1.8rem;
}

pre {
    max-height: 260px;
    min-height: 110px;
    overflow: auto;
    margin: 18px 0 0;
    padding: 16px;
    color: var(--metin);
    background: var(--panel-ikincil);
    border: 1px solid var(--cizgi);
    border-radius: var(--yaricap);
    white-space: pre-wrap;
    word-break: break-word;
}

.tablo-panel {
    max-height: 260px;
    overflow: auto;
    border: 1px solid var(--cizgi);
    border-radius: var(--yaricap);
    background: var(--panel-ikincil);
}

.tablo-panel.bos-durum {
    max-height: none;
    border-style: dashed;
}

.tablo-panel .mini-tablo {
    min-width: 0;
}

.tablo-panel .mini-tablo thead th {
    position: sticky;
    top: 0;
    z-index: 1;
}

.tablo-panel .mini-tablo th,
.tablo-panel .mini-tablo td {
    padding: 10px;
    white-space: nowrap;
}

.tablo-panel .mini-tablo td:last-child {
    white-space: normal;
    word-break: break-word;
}

.panel-notu {
    margin: 0;
    padding: 14px;
    color: var(--soluk-metin);
    line-height: 1.45;
}

.gorsel-alan,
.adim-alani {
    display: grid;
    gap: 12px;
    margin-top: 18px;
    min-width: 0;
    overflow-x: auto;
}

.bos-durum {
    padding: 20px;
    color: var(--soluk-metin);
    text-align: center;
    background: var(--panel-ikincil);
    border: 1px dashed var(--cizgi);
    border-radius: var(--yaricap);
}

.adim-kutusu,
.huffman-birlesme-karti {

    animation: yukariGel 0.24s ease both;
}

.adim-kutusu {
    padding: 12px 14px;
    border: 1px solid var(--cizgi);
    border-radius: var(--yaricap);
    background: var(--panel-ikincil);
}

.adim-kutusu strong {
    display: block;
    color: var(--lacivert-acik);
    margin-bottom: 5px;
}

.mini-tablo {
    width: 100%;
    border-collapse: collapse;
    overflow: hidden;
    border-radius: var(--yaricap);
}

.mini-tablo th,
.mini-tablo td,
table th,
table td {
    padding: 12px;
    border-bottom: 1px solid var(--cizgi);
    text-align: left;
    vertical-align: top;
}

.mini-tablo th,
table th {
    color: var(--metin);
    background: var(--panel-ikincil);
}

.mini-tablo td,
table td {
    color: var(--soluk-metin);
}

.huffman-agac-karti {
    border: 1px solid var(--cizgi);
    border-radius: var(--yaricap);
    background: #ffffff;
    box-shadow: 0 14px 34px rgba(18, 53, 91, 0.1);
}

.huffman-agac-karti {
    min-width: 0;
    padding: 18px;
}

.huffman-kart-ust {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    align-items: flex-start;
    margin-bottom: 14px;
}

.huffman-kart-ust h3 {
    margin-bottom: 6px;
}

.huffman-kart-ust p {
    max-width: 620px;
    margin-bottom: 0;
    color: var(--soluk-metin);
    line-height: 1.5;
}

.huffman-agac-kapsayici {
    width: 100%;
    min-height: 620px;
    max-height: 780px;
    overflow: auto;
    padding: 24px;
    border: 1px solid #dce5ef;
    border-radius: 14px;
    background: linear-gradient(180deg, #f8fafc 0%, #edf3f8 100%);
}

.huffman-svg {
    display: block;
    max-width: none;
    height: auto;
    margin: 0 auto;
}

.huffman-cizgiler line {
    stroke: #8ea0b5;
    stroke-width: 1.8;
    stroke-linecap: round;
    opacity: 0.88;
    animation: cizgiBelir 0.35s ease both;
}

.huffman-dal-etiketi circle {
    fill: #ffffff;
    stroke: #c8d6e5;
    stroke-width: 1.4;
}

.huffman-dal-etiketi text {
    fill: #31516f;
    font-size: 12px;
    font-weight: 800;
}

.huffman-dugum circle {
    stroke-width: 2.5;
    filter: drop-shadow(0 8px 10px rgba(18, 53, 91, 0.18));
}

.huffman-dugum.kok-dugum circle {
    fill: #7c3aed;
    stroke: #5b21b6;
}

.huffman-dugum.ic-dugum circle {
    fill: #2563eb;
    stroke: #1d4ed8;
}

.huffman-dugum.ara-dugum circle {
    fill: #16a34a;
    stroke: #15803d;
}

.huffman-dugum.yaprak-dugum circle {
    fill: #f59e0b;
    stroke: #d97706;
}

.huffman-dugum.karakter-dugum circle {
    stroke: #94a3b8;
}

.huffman-dugum text {
    font-family: Arial, Helvetica, sans-serif;
    pointer-events: none;
}

.huffman-dugum .dugum-karakter {
    fill: #ffffff;
    font-size: 10px;
    font-weight: 800;
}

.huffman-dugum .dugum-frekans {
    fill: rgba(255, 255, 255, 0.86);
    font-size: 9px;
    font-weight: 700;
}

.huffman-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 14px;
    margin-top: 14px;
    color: var(--soluk-metin);
    font-size: 0.92rem;
}

.huffman-legend span {
    display: inline-flex;
    align-items: center;
    gap: 7px;
}

.huffman-legend i {
    width: 13px;
    height: 13px;
    border-radius: 50%;
    display: inline-block;
}

.huffman-legend .kok {
    background: #7c3aed;
}

.huffman-legend .ic {
    background: #2563eb;
}

.huffman-legend .ara {
    background: #16a34a;
}

.huffman-legend .yaprak {
    background: #f59e0b;
}

.huffman-legend .karakter {
    background: #cbd5e1;
    border: 1px solid #94a3b8;
}

.huffman-adim-baslik {
    padding: 14px;
    border: 1px solid var(--cizgi);
    border-radius: var(--yaricap);
    background: var(--panel-ikincil);
}

.huffman-adim-baslik strong,
.huffman-adim-baslik span {
    display: block;
}

.huffman-adim-baslik span {
    margin-top: 4px;
    color: var(--soluk-metin);
}

.huffman-adim-liste {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding-bottom: 6px;
}

.huffman-birlesme-karti {
    flex: 0 0 300px;
    padding: 14px;
    border: 1px solid var(--cizgi);
    border-radius: var(--yaricap);
    background: var(--panel-ikincil);
}

.huffman-birlesme-karti>strong {
    display: block;
    margin-bottom: 12px;
    color: var(--lacivert-acik);
}

.huffman-birlesme-akis {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
}

.mini-huffman-dugum {
    display: inline-grid;
    place-items: center;
    width: 62px;
    height: 62px;
    border-radius: 50%;
    border: 2px solid var(--lacivert-acik);
    background: var(--panel);
}

.mini-huffman-dugum span {
    max-width: 52px;
    overflow: hidden;
    font-weight: 700;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.mini-huffman-dugum small {
    color: var(--soluk-metin);
    font-weight: 700;
}

.mini-huffman-dugum.yeni {
    color: #ffffff;
    background: var(--lacivert);
    border-color: var(--lacivert);
}

.mini-huffman-dugum.yeni small {
    color: #ffffff;
}

.arti-isareti,
.ok-isareti {
    color: var(--soluk-metin);
    font-size: 1.25rem;
    font-weight: 700;
}

.karsilastirma-bolumu {
    margin-top: 22px;
}

.tablo-kapsayici {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 620px;
}

@keyframes yukariGel {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes cizgiBelir {
    from {
        opacity: 0;
        stroke-dasharray: 12;
        stroke-dashoffset: 12;
    }

    to {
        opacity: 0.72;
        stroke-dasharray: 0;
        stroke-dashoffset: 0;
    }
}

@keyframes heroBelir {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 1180px) {

    .ust-alan,
    .kart-baslik-satiri {
        flex-direction: column;
    }

    .ana-yerlesim {
        grid-template-columns: 1fr;
    }

    .yan-panel,
    .sag-panel {
        position: static;
    }

    .sonuc-izgara {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 560px) {

    .sayfa-kapsayici {
        width: min(100% - 20px, 1440px);
        padding-top: 10px;
    }

    .ust-alan,
    .giris-karti,
    .gorsel-karti,
    .adim-karti,
    .karsilastirma-bolumu,
    .yan-panel,
    .sag-kart {
        padding: 16px;
    }

    .ust-alan {
        padding: 18px;
        gap: 14px;
    }

    h1 {
        font-size: clamp(1.55rem, 8vw, 2.15rem);
        line-height: 1.08;
    }

    .baslik-alt-satir {
        margin-top: 3px;
    }

    .etiket {
        font-size: 0.68rem;
        letter-spacing: 0.1em;
    }

    .sonuc-izgara {
        grid-template-columns: 1fr;
    }

    .islem-dugmeleri,
    .ana-dugme-satiri {
        width: 100%;
    }

    .birincil-buton,
    .ikincil-buton {
        flex: 1 1 150px;
    }

    .huffman-kart-ust {
        flex-direction: column;
    }

}