/* =========================
   TOOLS
========================= */

.tools-section {
    padding: 100px 0;
}

.tools-grid {
    display: grid;

    grid-template-columns:
        repeat(3, minmax(0, 1fr));

    gap: 16px;
}

.tool-card {
    position: relative;

    min-height: 230px;

    padding: 26px;

    text-align: left;

    color: var(--text);
    background: var(--surface);

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

    cursor: pointer;

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

.tool-card:hover {
    transform: translateY(-3px);

    background: var(--surface-light);

    border-color: #3b424c;
}

.tool-card.active {
    border-color: var(--accent);
}

.tool-number {
    position: absolute;

    top: 22px;
    right: 24px;

    color: #555d67;

    font-size: 12px;
    font-weight: 700;
}

.tool-icon {
    font-size: 25px;

    margin-bottom: 25px;
}

.tool-card h3 {
    font-size: 21px;

    letter-spacing: -0.5px;
}

.tool-card p {
    margin-top: 10px;

    color: var(--muted);

    font-size: 14px;
}


/* =========================
   CALCULATOR PANEL
========================= */

.calculator-panel {
    margin-top: 30px;

    padding: 45px;

    background: var(--surface);

    border: 1px solid var(--border);

    border-radius: var(--radius);

    scroll-margin-top: 95px;
}

.calculator-tool {
    display: none;
}

.calculator-tool.active {
    display: block;
}

.calculator-header {
    display: flex;
    justify-content: space-between;

    margin-bottom: 35px;
}

.calculator-header h2 {
    margin-top: 8px;

    font-size: 32px;

    letter-spacing: -1.5px;
}

.calculator-header p {
    max-width: 600px;

    margin-top: 10px;

    color: var(--muted);
}


/* =========================
   MODE BUTTONS
========================= */

.zone-step {
    margin-bottom: 26px;
}

.zone-step--sub {
    margin-top: 6px;
    margin-bottom: 22px;
}

.step-label {
    display: inline-flex;
    align-items: center;

    margin-bottom: 10px;

    color: var(--muted);

    font-size: 11px;
    font-weight: 800;
    letter-spacing: 1.4px;
    text-transform: uppercase;
}

.step-label::before {
    content: "";

    width: 7px;
    height: 7px;

    margin-right: 9px;

    background: var(--accent);

    border-radius: 50%;
}

.mode-buttons {
    display: flex;

    gap: 8px;

    margin-bottom: 0;

    flex-wrap: wrap;
}

.mode-button {
    padding: 11px 15px;

    background: rgba(255, 255, 255, 0.02);

    border: 1px solid var(--border);

    border-radius: 9px;

    color: var(--muted);

    cursor: pointer;

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

.mode-button:hover {
    color: var(--text);

    border-color: #414954;
    transform: translateY(-1px);
}

.mode-button.active {
    background: var(--accent);

    color: #080a0c;

    border-color: var(--accent);

    font-weight: 800;
    box-shadow: 0 10px 22px rgba(184, 255, 61, 0.14);
}

.heart-mode-selector {
    margin-bottom: 0;
}


/* =========================
   HEART RATE INFO
========================= */

.heart-method-info {
    margin-top: -12px;
    margin-bottom: 30px;

    padding: 16px 18px;

    background: rgba(255, 255, 255, 0.02);

    border: 1px solid var(--border);

    border-radius: 9px;
}

.heart-method-info p {
    color: var(--muted);

    font-size: 13px;

    line-height: 1.5;
}

.heart-method-info strong {
    color: var(--text);

    font-weight: 700;
}

.pace-zones-help p + p {
    margin-top: 10px;
}

.heart-profile-personalization {
    margin-bottom: 22px;
    padding: 16px 18px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.02);
}

.heart-profile-personalization-header {
    margin-bottom: 8px;
}

.heart-profile-personalization-tag {
    display: inline-flex;
    align-items: center;
    padding: 5px 10px;
    border-radius: 999px;
    background: rgba(184, 255, 61, 0.12);
    border: 1px solid rgba(184, 255, 61, 0.22);
    color: var(--accent);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.heart-profile-personalization p {
    margin: 0;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.55;
}

.heart-profile-personalization p + p {
    margin-top: 8px;
}

.heart-profile-personalization strong {
    color: var(--text);
    font-weight: 700;
}

.heart-profile-personalization-actions {
    margin-top: 14px;
}

.heart-load-training-data-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 10px 16px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border);
    border-radius: 9px;
    color: var(--text);
    font-weight: 700;
}

.heart-load-training-data-button:hover:not(:disabled) {
    color: var(--text);
    border-color: #414954;
    transform: translateY(-1px);
}

.heart-load-training-data-button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.heart-load-training-data-button:disabled {
    cursor: wait;
    opacity: 0.6;
}

.heart-profile-personalization-status {
    margin-top: 10px;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.5;
}

.heart-profile-personalization-status a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.equiv-profile-personalization {
    margin-bottom: 22px;
    padding: 16px 18px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.02);
}

.equiv-profile-personalization-header {
    margin-bottom: 8px;
}

.equiv-profile-personalization-tag {
    display: inline-flex;
    align-items: center;
    padding: 5px 10px;
    border-radius: 999px;
    background: rgba(184, 255, 61, 0.12);
    border: 1px solid rgba(184, 255, 61, 0.22);
    color: var(--accent);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.equiv-profile-personalization p {
    margin: 0;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.55;
}

.equiv-profile-personalization p + p {
    margin-top: 8px;
}

.equiv-profile-personalization strong {
    color: var(--text);
    font-weight: 700;
}

.equiv-profile-personalization-actions {
    margin-top: 14px;
}

.equiv-load-personal-bests-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 10px 16px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border);
    border-radius: 9px;
    color: var(--text);
    font-weight: 700;
}

.equiv-load-personal-bests-button:hover:not(:disabled) {
    color: var(--text);
    border-color: #414954;
    transform: translateY(-1px);
}

.equiv-load-personal-bests-button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.equiv-load-personal-bests-button:disabled {
    cursor: wait;
    opacity: 0.6;
}

.equiv-personal-best-selector-wrapper {
    margin-top: 14px;
}

.equiv-personal-best-selector-wrapper label {
    display: block;
    margin-bottom: 8px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
}

.equiv-personal-best-selector-wrapper select {
    width: 100%;
    max-width: 420px;
    padding: 10px 12px;
    border-radius: 9px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.02);
    color: var(--text);
}

.equiv-profile-personalization-status {
    margin-top: 10px;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.5;
}

.equiv-profile-personalization-status a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.goal-profile-personalization {
    margin-bottom: 22px;
    padding: 16px 18px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.02);
}

.goal-profile-personalization-header {
    margin-bottom: 8px;
}

.goal-profile-personalization-tag {
    display: inline-flex;
    align-items: center;
    padding: 5px 10px;
    border-radius: 999px;
    background: rgba(184, 255, 61, 0.12);
    border: 1px solid rgba(184, 255, 61, 0.22);
    color: var(--accent);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.goal-profile-personalization p {
    margin: 0;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.55;
}

.goal-profile-personalization p + p {
    margin-top: 8px;
}

.goal-profile-personalization strong {
    color: var(--text);
    font-weight: 700;
}

.goal-profile-personalization-actions {
    margin-top: 14px;
}

.goal-load-goals-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 10px 16px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border);
    border-radius: 9px;
    color: var(--text);
    font-weight: 700;
}

.goal-load-goals-button:hover:not(:disabled) {
    color: var(--text);
    border-color: #414954;
    transform: translateY(-1px);
}

.goal-load-goals-button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.goal-load-goals-button:disabled {
    cursor: wait;
    opacity: 0.6;
}

.goal-personal-goal-selector-wrapper {
    margin-top: 14px;
}

.goal-personal-goal-selector-wrapper label {
    display: block;
    margin-bottom: 8px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
}

.goal-personal-goal-selector-wrapper select {
    width: 100%;
    max-width: 420px;
    padding: 10px 40px 10px 12px;
    border-radius: 9px;
    border: 1px solid rgba(164, 174, 184, 0.28);
    background: rgba(15, 18, 24, 0.95);
    color: #f3f5f7;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: linear-gradient(45deg, transparent 50%, rgba(255, 255, 255, 0.58) 50%), linear-gradient(135deg, rgba(255, 255, 255, 0.58) 50%, transparent 50%);
    background-position: calc(100% - 18px) calc(50% - 2px), calc(100% - 13px) calc(50% - 2px);
    background-size: 5px 5px;
    background-repeat: no-repeat;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.02);
}

.goal-personal-goal-selector-wrapper select:focus {
    outline: 2px solid rgba(184, 255, 61, 0.2);
    outline-offset: 2px;
    border-color: rgba(184, 255, 61, 0.35);
}

.goal-profile-personalization-status {
    margin-top: 10px;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.5;
}

.goal-profile-personalization-status a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.pace-profile-personalization {
    margin-bottom: 22px;
    padding: 16px 18px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.02);
}

.pace-profile-personalization-header {
    margin-bottom: 8px;
}

.pace-profile-personalization-tag {
    color: var(--accent);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.pace-profile-personalization p {
    margin: 0;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.55;
}

.pace-personal-best-controls {
    display: grid;
    grid-template-columns: minmax(150px, 220px) minmax(0, 1fr) auto;
    align-items: end;
    gap: 12px;
    margin-top: 14px;
}

.pace-personal-best-selector-wrapper label {
    display: block;
    margin-bottom: 8px;
    color: var(--muted);
    font-size: 12px;
    font-weight: 700;
}

.pace-personal-best-selector-wrapper select {
    width: 100%;
    min-height: 42px;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 9px;
    background: rgba(255, 255, 255, 0.02);
    color: var(--text);
}

.pace-personal-best-summary {
    align-self: center;
}

.pace-use-personal-best-button {
    min-height: 42px;
    color: var(--text);
    font-weight: 700;
}

.pace-use-personal-best-button:disabled {
    cursor: wait;
    opacity: 0.6;
}

.pace-profile-personalization-status {
    margin-top: 10px !important;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.5;
}

.pace-profile-personalization-status[data-type="error"] {
    color: var(--danger);
}

.pace-profile-personalization-status a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.pace-profile-personalization button:focus-visible,
.pace-profile-personalization select:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.pace-zones-education p + p {
    margin-top: 10px;
}

.pace-zones-education a {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.pace-zones-education a:hover {
    color: var(--accent-dark);
}


/* =========================
   FORM
========================= */

.calculator-form {
    display: grid;

    grid-template-columns:
        repeat(2, minmax(0, 1fr));

    gap: 22px;
}

.input-group {
    display: flex;

    flex-direction: column;

    gap: 8px;
}

.input-group label {
    color: var(--text);

    font-size: 13px;

    font-weight: 700;
}

.input-help {
    color: var(--muted);
    font-size: 12px;
    line-height: 1.4;
}

.optional {
    color: var(--muted);

    font-weight: 400;
}

input,
select {
    width: 100%;

    height: 48px;

    padding: 0 14px;

    background: #0d1014;

    border: 1px solid var(--border);

    border-radius: 8px;

    color: var(--text);

    outline: none;

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

input:focus,
select:focus {
    border-color: var(--accent);

    box-shadow:
        0 0 0 3px rgba(184, 255, 61, 0.08);
}

input::placeholder {
    color: #5e6670;
}

input.is-invalid,
select.is-invalid {
    border-color: rgba(255, 107, 107, 0.9);
    background: rgba(255, 107, 107, 0.04);
    box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.08);
}

select {
    cursor: pointer;
}

input[type="number"] {
    appearance: auto;
}


/* =========================
   QUICK DISTANCES
========================= */

.quick-distances {
    display: flex;

    gap: 7px;

    flex-wrap: wrap;

    margin-bottom: 2px;
}

.quick-distance {
    padding: 7px 11px;

    background: #0d1014;

    border: 1px solid var(--border);

    border-radius: 6px;

    color: var(--muted);

    font-size: 12px;

    font-weight: 700;

    cursor: pointer;

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

.quick-distance:hover {
    color: var(--text);

    border-color: #414954;
}

.quick-distance.active {
    background: var(--accent);

    border-color: var(--accent);

    color: #080a0c;
}


/* =========================
   INPUT + UNIT
========================= */

.input-with-unit {
    position: relative;
}

.input-with-unit input {
    padding-right: 75px;
}

.input-with-unit span {
    position: absolute;

    top: 50%;
    right: 14px;

    transform: translateY(-50%);

    color: var(--muted);

    font-size: 13px;

    pointer-events: none;
}


/* =========================
   TIME INPUT
========================= */

.time-input {
    display: flex;

    align-items: center;

    gap: 7px;
}

.time-input > div {
    position: relative;

    flex: 1;
}

.time-input input {
    width: 100%;

    padding-right: 30px;

    text-align: center;
}

.time-input div span {
    position: absolute;

    right: 9px;
    top: 50%;

    transform: translateY(-50%);

    color: var(--muted);

    font-size: 11px;

    pointer-events: none;
}

.time-separator {
    color: var(--muted);

    font-size: 20px;

    font-weight: 700;

    margin-top: -18px;
}


/* =========================
   CALCULATE BUTTON
========================= */

.calculate-button {
    grid-column: 1 / -1;

    height: 50px;

    margin-top: 5px;

    background: var(--accent);

    color: #080a0c;

    border-radius: 8px;

    font-weight: 800;

    cursor: pointer;

    transition: 0.2s;
}

.calculate-button:hover {
    background: var(--accent-dark);

    transform: translateY(-1px);
}


/* =========================
   RESULT BOX
========================= */

.result-box {
    display: none;

    margin-top: 32px;

    padding: 34px;

    background:
        linear-gradient(
            145deg,
            #151a20 0%,
            #0d1014 100%
        );

    border: 1px solid #303740;

    border-radius: 14px;

    position: relative;

    overflow: hidden;
}

.result-box::before {
    content: "";

    position: absolute;

    top: 0;
    left: 0;
    right: 0;

    height: 2px;

    background: var(--accent);
}

.result-box.visible {
    display: block;

    animation: resultAppear 0.25s ease-out;
}

.result-box .copy-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    margin-top: 22px;
}

@keyframes resultAppear {

    from {
        opacity: 0;
        transform: translateY(6px);
    }

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

}

.result-main {
    font-size: clamp(36px, 4vw, 52px);

    line-height: 1;

    font-weight: 850;

    letter-spacing: -2px;

    color: var(--text);
}

.result-label {
    margin-top: 8px;

    color: var(--muted);

    font-size: 11px;

    font-weight: 800;

    letter-spacing: 1.5px;

    text-transform: uppercase;
}

.result-box .result-label + .result-main {
    margin-top: 4px;
}

.result-note {
    margin-top: 20px;
    line-height: 1.5;
    text-transform: none;
    letter-spacing: 0;
}

.result-secondary {
    display: grid;

    grid-template-columns:
        repeat(2, minmax(0, 180px));

    gap: 12px;

    margin-top: 30px;

    padding-top: 22px;

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

.result-secondary-item {
    padding: 14px 16px;

    background: rgba(255, 255, 255, 0.025);

    border: 1px solid #20262d;

    border-radius: 9px;
}

.result-secondary-item strong {
    display: block;

    font-size: 19px;

    font-weight: 800;

    letter-spacing: -0.4px;
}

.result-secondary-item span {
    display: block;

    margin-top: 3px;

    color: var(--muted);

    font-size: 10px;

    font-weight: 700;

    letter-spacing: 1px;

    text-transform: uppercase;
}


/* =========================
   RESULT TABLE
========================= */

.result-table {
    width: 100%;

    border-collapse: collapse;

    margin-top: 26px;

    overflow: hidden;

    border: 1px solid var(--border);

    border-radius: 9px;
}

.result-table th,
.result-table td {
    padding: 13px 15px;

    text-align: left;

    border-bottom: 1px solid var(--border);
}

.result-table tr:last-child td {
    border-bottom: none;
}

.result-table th {
    color: var(--muted);

    background: rgba(255, 255, 255, 0.025);

    font-size: 10px;

    font-weight: 800;

    letter-spacing: 1px;

    text-transform: uppercase;
}

.result-table td {
    font-size: 14px;
}

.result-table td:last-child {
    font-weight: 700;
}

.result-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}


/* =========================
   RESPONSIVE
========================= */

@media (max-width: 900px) {

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

    .calculator-form {
        grid-template-columns: 1fr;
    }

    .calculate-button {
        grid-column: auto;
    }

}


@media (max-width: 600px) {

    .tools-section {
        padding: 70px 0;
    }

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

    .calculator-panel {
        padding: 25px 18px;
    }

    .calculator-header h2 {
        font-size: 27px;
    }

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

    .zone-step--sub {
        margin-bottom: 18px;
    }

    .step-label {
        font-size: 10px;
        letter-spacing: 1.2px;
    }

    .mode-button {
        width: 100%;
        justify-content: center;
        text-align: center;
    }

    .quick-distances {
        gap: 5px;
    }

    .pace-personal-best-controls {
        grid-template-columns: 1fr;
        align-items: stretch;
    }

    .quick-distance {
        padding: 7px 9px;
    }

    .time-input {
        gap: 4px;
    }

    .time-input input {
        padding-left: 4px;
        padding-right: 25px;
    }

    .time-separator {
        font-size: 16px;
    }

    .result-box {
        padding: 25px 20px;
    }

    .result-main {
        font-size: 34px;
    }

    .result-secondary {
        grid-template-columns: 1fr;

        gap: 9px;
    }

    .result-secondary-item {
        padding: 12px 14px;
    }

    .result-table {
        font-size: 13px;
    }

    .result-table th,
    .result-table td {
        padding: 11px 9px;
    }

}

.time-fieldset {
    min-width: 0;

    margin: 0;
    padding: 0;

    border: 0;
}

.time-fieldset legend {
    margin-bottom: 8px;

    color: var(--text);

    font-size: 13px;

    font-weight: 700;
}

.visually-hidden {
    position: absolute;

    width: 1px;
    height: 1px;

    padding: 0;
    margin: -1px;

    overflow: hidden;
    clip: rect(0, 0, 0, 0);

    white-space: nowrap;

    border: 0;
}


/* =========================
   COPY BUTTON
========================= */

.copy-button {
    display: inline-flex;

    align-items: center;
    justify-content: center;

    margin-top: 26px;

    padding: 11px 18px;

    background: transparent;

    border: 1px solid var(--border);
    border-radius: 8px;

    color: var(--text);

    font-size: 13px;
    font-weight: 700;

    cursor: pointer;

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

.copy-button:hover {
    background: var(--surface-light);

    border-color: #3b424c;
}

.copy-button.copied {
    background: var(--accent);

    border-color: var(--accent);

    color: #080a0c;
}

.copy-button.copy-error {
    border-color: var(--danger);

    color: var(--danger);
}


/* =========================
   FOCUS VISIBLE
========================= */

.mode-button:focus-visible,
.quick-distance:focus-visible,
.calculate-button:focus-visible,
.copy-button:focus-visible,
.tool-card:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 2px solid var(--accent);

    outline-offset: 2px;
}


/* =========================
   AVISO: INICIA SESIÓN PARA MÁS HERRAMIENTAS
========================= */

.tools-login-notice {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;

    margin-top: 16px;
    padding: 18px 22px;

    background: rgba(184, 255, 61, 0.05);
    border: 1px solid rgba(184, 255, 61, 0.25);
    border-radius: var(--radius);
}

.tools-login-notice[hidden] {
    display: none;
}

.tools-login-notice__text {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.tools-login-notice__text span {
    color: var(--muted);
    font-size: 14px;
}

.tools-login-notice__link {
    flex: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 12px 18px;

    background: var(--accent);
    color: #090b0d;
    border: 1px solid rgba(184, 255, 61, 0.8);
    border-radius: 10px;

    font-weight: 800;
    letter-spacing: -0.02em;

    transition: transform 0.18s ease, background 0.18s ease;
}

.tools-login-notice__link:hover {
    transform: translateY(-1px);
    background: #c3f65a;
}

.tools-login-notice__link:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

@media (max-width: 700px) {
    .tools-login-notice {
        flex-direction: column;
        align-items: stretch;
        text-align: left;
    }
}