/* =========================================================
   PALINDROME CHECKER
   Marsharine A. Simpson
   ========================================================= */


/* -------------------------
   DESIGN TOKENS
------------------------- */

:root {
    --plum-950: #24112e;
    --plum-900: #32133f;
    --plum-800: #472056;
    --plum-700: #5d2d6d;
    --plum-600: #744182;

    --lavender-300: #d8c4df;
    --lavender-200: #e7dced;
    --lavender-100: #f3edf6;

    --ivory: #fbf8f3;
    --cream: #f5efe7;
    --white: #ffffff;

    --ink: #25202a;
    --muted: #68606d;
    --line: #ded5e2;

    --success: #2f6a50;
    --success-bg: #edf7f1;

    --warning: #8a493a;
    --warning-bg: #fbefeb;

    --shadow-sm: 0 8px 24px rgba(44, 22, 53, 0.08);
    --shadow-md: 0 18px 50px rgba(44, 22, 53, 0.12);
    --shadow-lg: 0 28px 70px rgba(44, 22, 53, 0.16);

    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 30px;

    --max-width: 1160px;
}


/* -------------------------
   RESET
------------------------- */

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;

    color: var(--ink);
    background:
        radial-gradient(
            circle at top right,
            rgba(216, 196, 223, 0.45),
            transparent 34rem
        ),
        var(--ivory);

    font-family:
        Inter,
        "Segoe UI",
        Arial,
        Helvetica,
        sans-serif;

    line-height: 1.6;
}

button,
textarea {
    font: inherit;
}

button {
    border: 0;
}

a {
    color: inherit;
}

img {
    display: block;
    max-width: 100%;
}


/* -------------------------
   PAGE SHELL
------------------------- */

.page-shell {
    width: min(100% - 40px, var(--max-width));
    margin: 0 auto;
}


/* -------------------------
   HERO
------------------------- */

.hero {
    max-width: 830px;

    margin: 0 auto;

    padding: 96px 0 55px;

    text-align: center;
}

.eyebrow,
.section-label,
.result-label {
    margin: 0 0 10px;

    color: var(--plum-600);

    font-size: 0.77rem;
    font-weight: 800;

    letter-spacing: 0.17em;
    text-transform: uppercase;
}

.hero h1 {
    margin: 0;

    color: var(--plum-950);

    font-family:
        Georgia,
        "Times New Roman",
        serif;

    font-size: clamp(3.2rem, 8vw, 6.8rem);
    font-weight: 600;

    letter-spacing: -0.055em;
    line-height: 0.95;
}

.hero-tagline {
    margin: 28px 0 8px;

    color: var(--plum-800);

    font-family:
        Georgia,
        "Times New Roman",
        serif;

    font-size: clamp(1.25rem, 3vw, 1.7rem);
    font-style: italic;
}

.hero-description {
    max-width: 650px;

    margin: 0 auto;

    color: var(--muted);

    font-size: 1.05rem;
}


/* -------------------------
   CHECKER CARD
------------------------- */

.checker-card {
    position: relative;

    max-width: 850px;

    margin: 0 auto 95px;
    padding: clamp(28px, 5vw, 52px);

    overflow: hidden;

    border: 1px solid rgba(93, 45, 109, 0.12);
    border-radius: var(--radius-lg);

    background:
        linear-gradient(
            145deg,
            rgba(255, 255, 255, 0.98),
            rgba(246, 240, 248, 0.96)
        );

    box-shadow: var(--shadow-lg);
}

.checker-card::before {
    position: absolute;

    top: -90px;
    right: -90px;

    width: 230px;
    height: 230px;

    border-radius: 50%;

    background: rgba(216, 196, 223, 0.26);

    content: "";
}

.checker-heading {
    position: relative;
    z-index: 1;

    display: flex;
    align-items: center;
    gap: 18px;

    margin-bottom: 32px;
}

.number-badge {
    display: grid;
    place-items: center;

    flex: 0 0 auto;

    width: 54px;
    height: 54px;

    border: 1px solid var(--lavender-300);
    border-radius: 50%;

    color: var(--plum-700);
    background: var(--lavender-100);

    font-size: 0.86rem;
    font-weight: 800;

    letter-spacing: 0.08em;
}

.checker-heading h2 {
    margin: 0;

    color: var(--plum-950);

    font-family:
        Georgia,
        "Times New Roman",
        serif;

    font-size: clamp(1.8rem, 4vw, 2.6rem);

    line-height: 1.1;
}


/* -------------------------
   FORM
------------------------- */

.input-label {
    display: inline-block;

    margin-bottom: 9px;

    color: var(--plum-900);

    font-size: 0.93rem;
    font-weight: 750;
}

#text-input {
    width: 100%;

    min-height: 150px;

    padding: 18px 20px;

    resize: vertical;

    border: 2px solid var(--line);
    border-radius: var(--radius-sm);

    outline: none;

    color: var(--ink);
    background: var(--white);

    font-size: 1.08rem;

    line-height: 1.55;

    transition:
        border-color 0.2s ease,
        box-shadow 0.2s ease,
        background-color 0.2s ease;
}

#text-input::placeholder {
    color: #99919d;
}

#text-input:hover {
    border-color: var(--lavender-300);
}

#text-input:focus {
    border-color: var(--plum-600);

    box-shadow:
        0 0 0 4px rgba(116, 65, 130, 0.12);
}

.input-meta {
    display: flex;
    justify-content: space-between;
    gap: 18px;

    margin-top: 9px;
}

.input-meta p {
    margin: 0;

    color: var(--muted);

    font-size: 0.83rem;
}

#character-count {
    flex: 0 0 auto;

    font-variant-numeric: tabular-nums;
}


/* -------------------------
   BUTTONS
------------------------- */

.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;

    margin-top: 27px;
}

.primary-button,
.secondary-button,
.example-button {
    cursor: pointer;

    transition:
        transform 0.18s ease,
        box-shadow 0.18s ease,
        background-color 0.18s ease,
        border-color 0.18s ease,
        color 0.18s ease;
}

.primary-button,
.secondary-button {
    min-height: 50px;

    padding: 12px 22px;

    border-radius: 999px;

    font-weight: 750;
}

.primary-button {
    border: 2px solid var(--plum-900);

    color: var(--white);
    background: var(--plum-900);

    box-shadow: 0 8px 18px rgba(50, 19, 63, 0.18);
}

.primary-button:hover {
    transform: translateY(-2px);

    background: var(--plum-700);

    box-shadow: 0 12px 25px rgba(50, 19, 63, 0.24);
}

.secondary-button {
    border: 2px solid var(--lavender-300);

    color: var(--plum-800);
    background: transparent;
}

.secondary-button:hover {
    transform: translateY(-2px);

    border-color: var(--plum-700);

    background: var(--lavender-100);
}

button:focus-visible,
a:focus-visible,
textarea:focus-visible {
    outline: 3px solid rgba(116, 65, 130, 0.35);
    outline-offset: 3px;
}


/* -------------------------
   RESULT PANEL
------------------------- */

.result-panel {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 18px;

    margin-top: 34px;
    padding: 22px;

    border: 1px solid var(--lavender-300);
    border-radius: var(--radius-md);

    background: var(--lavender-100);

    transition:
        border-color 0.2s ease,
        background-color 0.2s ease,
        transform 0.2s ease;
}

.result-icon {
    display: grid;
    place-items: center;

    width: 46px;
    height: 46px;

    border-radius: 50%;

    color: var(--white);
    background: var(--plum-700);

    font-size: 1.25rem;
}

.result-label {
    margin-bottom: 3px;
}

#result-text {
    margin: 0;

    color: var(--plum-950);

    font-family:
        Georgia,
        "Times New Roman",
        serif;

    font-size: 1.35rem;
    font-weight: 700;
}

.result-detail {
    margin: 5px 0 0;

    color: var(--muted);

    font-size: 0.92rem;
}


/* JavaScript can add these state classes */

.result-panel.is-palindrome {
    border-color: rgba(47, 106, 80, 0.35);

    background: var(--success-bg);
}

.result-panel.is-palindrome .result-icon {
    background: var(--success);
}

.result-panel.is-palindrome .result-label,
.result-panel.is-palindrome #result-text {
    color: var(--success);
}

.result-panel.not-palindrome {
    border-color: rgba(138, 73, 58, 0.28);

    background: var(--warning-bg);
}

.result-panel.not-palindrome .result-icon {
    background: var(--warning);
}

.result-panel.not-palindrome .result-label,
.result-panel.not-palindrome #result-text {
    color: var(--warning);
}

.result-panel.has-warning {
    border-color: #cf9c6d;

    background: #fff7ef;
}


/* -------------------------
   EXAMPLES
------------------------- */

.examples {
    margin-top: 32px;
    padding-top: 28px;

    border-top: 1px solid var(--line);
}

.examples-title {
    margin: 0 0 13px;

    color: var(--plum-900);

    font-size: 0.9rem;
    font-weight: 750;
}

.example-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.example-button {
    padding: 9px 14px;

    border: 1px solid var(--lavender-300);
    border-radius: 999px;

    color: var(--plum-700);
    background: var(--white);

    font-size: 0.88rem;
    font-weight: 650;
}

.example-button:hover {
    transform: translateY(-1px);

    border-color: var(--plum-600);

    background: var(--lavender-100);
}


/* -------------------------
   HOW IT WORKS
------------------------- */

.how-it-works {
    padding: 25px 0 105px;
}

.section-intro {
    max-width: 720px;

    margin-bottom: 42px;
}

.section-intro h2,
.project-notes h2 {
    margin: 0 0 12px;

    color: var(--plum-950);

    font-family:
        Georgia,
        "Times New Roman",
        serif;

    font-size: clamp(2.3rem, 5vw, 4rem);

    letter-spacing: -0.035em;
    line-height: 1.03;
}

.section-intro > p:last-child {
    max-width: 620px;

    margin: 0;

    color: var(--muted);

    font-size: 1.03rem;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.step-card {
    min-height: 245px;

    padding: 28px;

    border: 1px solid var(--line);
    border-radius: var(--radius-md);

    background: rgba(255, 255, 255, 0.72);

    box-shadow: var(--shadow-sm);
}

.step-number {
    display: block;

    margin-bottom: 40px;

    color: var(--plum-600);

    font-size: 0.78rem;
    font-weight: 850;

    letter-spacing: 0.15em;
}

.step-card h3 {
    margin: 0 0 9px;

    color: var(--plum-900);

    font-family:
        Georgia,
        "Times New Roman",
        serif;

    font-size: 1.45rem;
}

.step-card p {
    margin: 0;

    color: var(--muted);

    font-size: 0.95rem;
}


/* -------------------------
   PROJECT NOTES
------------------------- */

.project-notes {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
    align-items: center;
    gap: 60px;

    margin-bottom: 105px;
    padding: clamp(32px, 5vw, 55px);

    border-radius: var(--radius-lg);

    color: var(--white);
    background:
        linear-gradient(
            135deg,
            var(--plum-950),
            var(--plum-800)
        );

    box-shadow: var(--shadow-md);
}

.project-notes .eyebrow {
    color: var(--lavender-300);
}

.project-notes h2 {
    margin-bottom: 0;

    color: var(--white);
}

.skill-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 11px 18px;

    margin: 0;
    padding: 0;

    list-style: none;
}

.skill-list li {
    position: relative;

    padding-left: 20px;

    color: #efe8f1;

    font-size: 0.94rem;
}

.skill-list li::before {
    position: absolute;

    left: 0;

    color: var(--lavender-300);

    content: "✦";
}


/* -------------------------
   FOOTER
------------------------- */

.site-footer {
    margin-top: 30px;

    padding: 36px 20px;

    color: #e8ddeb;
    background: var(--plum-950);
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 25px;

    width: min(100%, var(--max-width));
    margin: 0 auto;
}

.footer-inner p {
    margin: 0;
}

.footer-name {
    margin-bottom: 4px !important;

    color: var(--white);

    font-weight: 800;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px 20px;
}

.footer-links a {
    color: var(--lavender-200);

    font-size: 0.9rem;
    font-weight: 700;

    text-decoration: none;
}

.footer-links a:hover {
    color: var(--white);

    text-decoration: underline;
    text-underline-offset: 4px;
}


/* -------------------------
   RESPONSIVE — TABLET
------------------------- */

@media (max-width: 820px) {

    .hero {
        padding-top: 75px;
    }

    .steps-grid {
        grid-template-columns: 1fr;
    }

    .step-card {
        min-height: auto;
    }

    .step-number {
        margin-bottom: 20px;
    }

    .project-notes {
        grid-template-columns: 1fr;

        gap: 34px;
    }

}


/* -------------------------
   RESPONSIVE — MOBILE
------------------------- */

@media (max-width: 620px) {

    .page-shell {
        width: min(100% - 28px, var(--max-width));
    }

    .hero {
        padding: 62px 0 38px;
    }

    .hero h1 {
        font-size: clamp(3rem, 17vw, 4.4rem);
    }

    .hero-tagline {
        margin-top: 20px;
    }

    .checker-card {
        margin-bottom: 72px;

        padding: 24px 20px;

        border-radius: 22px;
    }

    .checker-heading {
        align-items: flex-start;

        gap: 12px;
    }

    .number-badge {
        width: 44px;
        height: 44px;
    }

    #text-input {
        min-height: 130px;

        padding: 15px;
    }

    .input-meta {
        flex-direction: column;

        gap: 4px;
    }

    .button-group {
        display: grid;
        grid-template-columns: 1fr;
    }

    .primary-button,
    .secondary-button {
        width: 100%;
    }

    .result-panel {
        grid-template-columns: 1fr;
    }

    .result-icon {
        width: 40px;
        height: 40px;
    }

    .example-buttons {
        display: grid;
        grid-template-columns: 1fr;
    }

    .example-button {
        width: 100%;

        text-align: left;
    }

    .how-it-works {
        padding-bottom: 75px;
    }

    .project-notes {
        margin-bottom: 75px;

        padding: 30px 24px;
    }

    .skill-list {
        grid-template-columns: 1fr;
    }

    .footer-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-links {
        justify-content: flex-start;
    }

}


/* -------------------------
   REDUCED MOTION
------------------------- */

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

    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;

        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }

}